As filed with the Securities and Exchange Commission on February 15, 2006
                                                    Registration No. 333-130900


================================================================================

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                   ----------


                        PRE-EFFECTIVE AMENDMENT NO. 1 TO


                                    FORM SB-2

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                       ELECTRONIC SENSOR TECHNOLOGY, INC.
                 (Name of Small Business Issuer in Its Charter)

           Nevada                         3679                  98-0372780
 (State or Other Jurisdiction      (Primary Standard         (I.R.S. Employer
      of Incorporation or      Industrial Classification  Identification Number)
         Organization)                Code Number)

                           1077 Business Center Circle
                         Newbury Park, California 91320
                                 (805) 480-1994

          (Address and Telephone Number of Principal Executive Offices
                        and Principal Place of Business)

                                  Francis Chang
           Secretary and Vice President of Finance and Administration
                           1077 Business Center Circle
                         Newbury Park, California 91320
                                 (805) 480-1994
            (Name, Address and Telephone Number of Agent For Service)

                                 With a copy to:

                               Neil W. Rust, Esq.
                                White & Case LLP
                              633 West Fifth Street
                          Los Angeles, California 90071
                                 (213) 620-7700

        Approximate Date of Proposed Sale to the Public: As soon as practicable
after this registration statement becomes effective.

        If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. [ ]

        If this form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]

        If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]

        If delivery of the prospectus is expected to be made pursuant to Rule
434, please check the following box. [ ]

================================================================================



                         CALCULATION OF REGISTRATION FEE




                                               PROPOSED          PROPOSED
                              AMOUNT           MAXIMUM            MAXIMUM          AMOUNT OF
TITLE OF SECURITIES           TO BE          OFFERING PRICE      AGGREGATE       REGISTRATION
TO BE REGISTERED            REGISTERED         PER UNIT        OFFERING PRICE         FEE
-----------------------   ---------------   ---------------   ---------------   ---------------
                                                                        
Common stock, par value      1,925,000 (1)        $  1.0000      $  1,925,000       $    205.98
 $.001 per share
Common stock, par value      1,500,000 (2)        $  1.0000      $  1,500,000       $    160.50
 $.001 per share
Common stock, par value        130,000 (3)        $   .8145      $    105,882       $     11.33
 $.001 per share
Common stock, par value        350,000 (4)        $  2.4000      $    840,000       $     90.00
 $.001 per share
Common stock, par value     21,058,770 (5)        $   .4544      $  9,569,105       $  1,023.89
 $.001 per share
Common stock, par value        485,213 (6)        $   .4761      $    231,010       $     24.72
 $.001 per share
  Total                        25,448,983                        $ 14,170,997       $  1,516.42*


(1)   1,925,000 shares of common stock of Electronic Sensor Technology, Inc.,
      par value $.001 per share issued on February 1, 2005 at a price of
      approximately $1.00 per share (unit price of $1.00, such units including
      one share of common stock and a warrant to purchase one share of common
      stock at an exercise price of $1.00 per share).

(2)   1,500,000 shares of common stock underlying three-year warrants issued
      on February 1, 2005 with an exercise price of $1.00 per share.


(3)   130,000 shares of common stock issued on December 5, 2005 in exchange
      for services, the value of which totaled $105,882.


(4)   350,000 shares of common stock underlying a five-year warrant issued on
      December 5, 2005 with an exercise price of $2.40 per share.


(5)   21,058,770 shares of common stock underlying 110% of an aggregate
      principal amount of $7,000,000 of 8% unsecured convertible debentures Due
      December 7, 2009 issued on December 7, 2005 with a conversion price of
      $.4544 per share, plus interest on the debentures that may be paid in
      common stock.

(6)   485,213 shares of common stock underlying a five-year warrant issued on
      December 7, 2005 with an exercise price of $.4761 per share.


*     $1,404.07 of registration fee was previously paid.


THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT
SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF THE
SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.



PROSPECTUS

                     [LOGO OF ELECTRONIC SENSOR TECHNOLOGY]


                       ELECTRONIC SENSOR TECHNOLOGY, INC.
                        25,448,983 SHARES OF COMMON STOCK

        This prospectus is part of a registration statement on Form SB-2 that we
filed with the Securities and Exchange Commission. Under this registration
statement, the holders of common stock named in this registration statement may,
and the holders of the warrants and the debentures described below may upon
exercise of such warrants and upon conversion of such debentures, offer for
resale up to a total of 25,448,983 shares of common stock at any time at market
prices prevailing at the time of the sale or at privately negotiated prices. The
selling security holders may sell the common stock directly to purchasers or
through underwriters, broker-dealers or agents, who may receive compensation in
the form of discounts, concessions or commissions.

        The 25,448,983 shares of common stock that may be sold by selling
security holders pursuant to this registration statement consist of:

        o  1,925,000 shares of common stock of Electronic Sensor Technology,
           Inc. (formerly Bluestone Ventures Inc.), par value $.001 per
           share, which were issued in a private offering on February 1,
           2005;

        o  1,500,000 shares of common stock underlying three-year warrants to
           purchase such common stock at an exercise price of $1.00 per
           share, which were issued in the same private offering on
           February 1, 2005;

        o  130,000 shares of common stock, which were issued in a private
           offering on December 5, 2005;

        o  350,000 shares of common stock underlying a five-year warrant to
           purchase such common stock at an exercise price of $2.40 per
           share, which was issued in a private offering on December 5,
           2005;

        o  21,058,770 shares of common stock, which include 110% of shares
           underlying 8% unsecured convertible debentures due December 7,
           2009, which were issued in a private offering on December 7,
           2005 and shares that, at our option, may be used to pay interest
           on the debentures; and

        o  485,213 shares of common stock underlying a five-year warrant to
           purchase such common stock at an exercise price of $0.4761 per
           share, which was issued in a private offering on December 7,
           2005.

        We have agreed to register the foregoing shares of common stock in order
to facilitate secondary trading by the holders of the aforementioned common
stock, debentures and warrants.

        Our common stock is quoted on the OTC bulletin board under the symbol
"ESNR:OB".

        INVESTING IN OUR COMMON STOCK INVOLVES RISK. SEE "RISK FACTORS"
        BEGINNING ON PAGE 2 FOR A DISCUSSION OF CERTAIN RISKS THAT YOU SHOULD
        CONSIDER BEFORE INVESTING IN OUR COMMON STOCK.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR PASSED UPON THE
ADEQUACY OR ACCURACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.


                       This prospectus is dated [ ], 2006




        In making your investment decision, you should rely only on the
information contained in this prospectus and in each prospectus supplement, if
any. We have not authorized anyone to provide you with any other information. If
you receive any unauthorized information, you must not rely on it. This
prospectus is not an offer to sell these securities and is not soliciting an
offer to buy these securities in any state or jurisdiction where the offer or
sale of these securities is not permitted. You should assume that the
information appearing in this prospectus and any prospectus supplement is
accurate only as of the respective dates thereof. Our business, financial
condition, results of operations and prospects may have changed since those
dates.


                                TABLE OF CONTENTS




                                                                                                     Page
                                                                                                     ----
                                                                                                  
        Prospectus Summary...........................................................................   1
        Risk Factors.................................................................................   2
        Use of Proceeds..............................................................................   9
        Determination of Offering Price..............................................................   9
        Selling Security Holders.....................................................................   9
        Plan of Distribution.........................................................................  14
        Legal Proceedings............................................................................  16
        Directors, Executive Officers and Control Persons............................................  16
        Security Ownership of Certain Beneficial Owners and Management...............................  18
        Description of Securities....................................................................  20
        Interest of Named Experts and Counsel........................................................  21
        Disclosure of Commission Position on Indemnification for Securities Act Liabilities..........  21
        Description of Business......................................................................  21
        Management's Discussion and Analysis of Financial Condition and Results of Operations........  29
        Description of Property......................................................................  33
        Certain Relationships and Related Transactions...............................................  33
        Market for Common Equity and Related Stockholder Matters.....................................  34
        Executive Compensation.......................................................................  36
        Financial Statements.........................................................................  41
        Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.........  42
        Where You Can Find More Information..........................................................  42
        Special Note of Caution Regarding Forward-Looking Statements.................................  43
        Legal Matters................................................................................  43
        Experts......................................................................................  43



                                      (i)


                               PROSPECTUS SUMMARY


        This summary highlights information described more fully elsewhere in
this prospectus. This summary does not contain all of the information that you
should consider before investing in our common stock. You should read the entire
prospectus carefully, including "Risk Factors" and our audited and unaudited
financial statements and the notes to those financial statements, which are
included in this prospectus.


OVERVIEW OF THE COMPANY


        Electronic Sensor Technology is engaged in the development, manufacture,
and sale of a patented product called zNose(R), a device designed to detect and
analyze chemical odors and vapors, or, in other words, an electronic "nose." The
zNose(R) identifies the chemical makeup of any fragrance, vapor or odor. The
zNose(R) does this by creating a visual image of the fragrance, vapor or odor
that it detects, so that the user of the zNose(R) may easily identify the
fragrance, vapor or odor. We are involved in ongoing product research and
development efforts in the homeland security and laboratory instrumentation
markets.

        Electronic Sensor Technology was originally incorporated under the name
"Bluestone Ventures Inc.", on July 12, 2000. From inception until February 1,
2005, we were engaged in the business of acquiring, exploring and developing
certain mining properties in Canada. On January 26, 2005, a transaction closed
whereby:

        (i)   Amerasia Acquisition Corp., a wholly-owned subsidiary of
              Bluestone, merged with and into Amerasia Technology, Inc.,
              holder of approximately 55% of the partnership interests of
              Electronic Sensor Technology, L.P. (the predecessor business of
              Electronic Sensor Technology, Inc.), such that Amerasia
              Technology became a wholly-owned subsidiary of Bluestone;

        (ii)  L&G Acquisition Corp., a wholly owned subsidiary of Bluestone,
              merged with and into L&G Sensor Technology, L.P., holder of
              approximately 45% of the partnership interests of Electronic
              Sensor Technology, L.P., such that L&G Sensor Technology became
              a wholly-owned subsidiary of Bluestone;

        (iii) as a result of the merger of (i) and (ii), Bluestone indirectly
              acquired all of the partnership interests of Electronic Sensor
              Technology, L.P.; and

        (iv)  Bluestone issued 20,000,000 shares of its common stock to the
              shareholders of Amerasia Technology and L&G Sensor Technology.

        Upon the acquisition of Electronic Sensor Technology, L.P., we abandoned
our mining business and adopted Electronic Sensor Technology, L.P.'s business of
developing, manufacturing and selling the vapor analysis device. Prior to the
closing of the aforementioned mergers, we changed our name to "Electronic Sensor
Technology, Inc."

        Electronic Sensor Technology's executive offices are located at 1077
Business Center Circle, Newbury Park, California 91320, telephone: (805)
480-1994.



THE OFFERING

Issuer.............................     Electronic Sensor Technology, Inc.
Securities Offered.................     25,448,983 shares of common stock, par
                                        value $.001.
Use of Proceeds....................     We will not receive any proceeds from
                                        the resale by the selling security
                                        holders of the common stock registered
                                        pursuant to this registration statement.


                                       -1-


SUMMARY FINANCIAL DATA

        The financial data set forth below under the captions "Results of
Operations Data" and "Balance Sheet Data" for the years ended December 31, 2004
and December 31, 2003 and as of December 31, 2004, respectively, are derived
from our financial statements, included elsewhere in this prospectus, audited by
Sherb & Co., LLP, independent public accountants. The data for the nine months
ended September 30, 2005 and September 30, 2004 are derived from our unaudited
financial statements included elsewhere in this prospectus. In the opinion of
management, the unaudited financial statements have been prepared on the same
basis as the audited financial statements. The results of operations for the
nine months ended September 30, 2005 are not necessarily indicative of results
to be expected for any other interim period or the entire year. The financial
data set forth below should be read in conjunction with the financial statements
and notes thereto included elsewhere in this prospectus and "Management's
Discussion and Analysis of Financial Condition and Results of Operations." All
statistical data set forth herein is unaudited.


                           RESULTS OF OPERATIONS DATA



                                                                            NINE MONTHS ENDED
                                             YEAR ENDED DECEMBER 31,          SEPTEMBER 30,
                                            -------------------------   -------------------------
                                               2004          2003          2005          2004
                                            -----------   -----------   -----------   -----------
                                                                        (unaudited)   (unaudited)
                                                                            
Revenues                                    $ 1,268,416   $ 1,242,296   $ 1,380,237     $ 958,606
Cost of sales                                 1,039,280     1,143,350     1,087,064       723,386
Gross profit                                    229,136        98,946       293,173       235,220
Operating expenses                              525,585       414,371     1,949,102       435,743
Net operating loss                             (296,449)     (315,425)   (1,655,929)     (200,523)
Other income and expense                       (114,767)      (78,972)      (45,288)     (142,624)
Net loss                                       (411,216)     (394,397)   (1,701,217)     (343,147)
Loss per common share, basic
 and diluted                                      (0.01)        (0.01)        (0.03)        (0.01)
Weighted average number of
 common shares, basic and diluted            49,983,745    49,983,745    53,525,865    49,983,745


                               BALANCE SHEET DATA


                                                             DECEMBER 31, 2004   SEPTEMBER 30, 2005
                                                             -----------------   ------------------
                                                                                     (unaudited)
                                                                                    
1Working (deficit) capital                                          $(5,574,849)           $ 180,842
Total assets                                                           615,953            2,515,767
Total liabilities                                                    6,126,646            2,203,666
Partners' deficit (December 31,
 2004)/Shareholders' equity (September 30, 2005)                    (5,510,693)             312,103



                                  RISK FACTORS


        You should carefully consider each of the following risk factors, as
well as the other information contained elsewhere in this prospectus before
deciding to purchase any of our common stock. We face risks other than those
listed here, but at present consider such risks immaterial. We may also face
additional risks which are unknown to us at this time. Because of the following
factors, as well as other variables affecting our operating results, past
financial performance may not be a reliable indicator of future performance, and
historical trends should not be used to anticipate results or trends in future
periods.


RISKS RELATED TO OUR COMPANY

                                       -2-


WE HAVE A SIGNIFICANT ACCUMULATED DEFICIT AND HAVE RECEIVED AN OPINION FROM
OUR AUDITORS REGARDING OUR ABILITY TO CONTINUE AS A GOING CONCERN, AND WE MAY
NEVER ACHIEVE PROFITABILITY.

        We have incurred significant net losses every year since our inception,
including net losses in 2004 and 2003. These losses have resulted principally
from expenses incurred in our research and development programs and general and
administrative expenses. To date, we have not generated significant recurring
revenues. Our limited revenues that derive from sales of the zNose(R) product
have not been and may not be sufficient to sustain our operations. We anticipate
that we will continue to incur substantial operating losses based on projected
sales revenues less manufacturing, general and administrative and other
operating costs for the next twelve months. We expect that our revenues will not
be sufficient to sustain our operations for the near term, notwithstanding any
anticipated revenues we may receive when our vapor detection products obtain
increased visibility in our markets, due to the significant costs associated
with the development and marketing of our products. No assurances can be given
when we will ever be profitable.

        We expect to continue to experience losses until the time, if ever, when
we are able to sell products sufficient to generate revenues adequate to support
our operations. If we fail to become profitable, we may be forced to cease
operations.

OUR LIMITED MANUFACTURING EXPERIENCE AND CAPACITY MAY LIMIT OUR ABILITY TO GROW
OUR REVENUES.

        To be successful, we must manufacture our products in compliance with
industry standards and on a timely basis, while maintaining product quality and
acceptable manufacturing costs. We also currently use a limited number of
sources for most of the supplies and services that we use in the manufacturing
of our vapor detection and analysis technology. We do not have agreements with
our suppliers. Our manufacturing strategy presents the following risks:

     o  delays in the quantities needed for product development could
        delay commercialization of our products in development;

     o  if market demand for our products increases suddenly, our
        current suppliers might not be able to fulfill our commercial
        needs, which would require us to seek new supply arrangements
        and may result in substantial delays in meeting market demand;
        and

     o  we may not have intellectual property rights, or may have to
        share intellectual property rights, to any improvements in the
        manufacturing processes or new manufacturing processes for our
        products.

        Any of these factors could delay commercialization of our products under
development, entail higher costs and result in our being unable to effectively
sell our products.

WE FACE SIGNIFICANT COMPETITION AND OUR BUSINESS AND FINANCIAL RESULTS COULD
SUFFER FROM COMPETITION.


        While we are unaware of any competitor that has created a vapor analysis
device similar to the zNose(R), there are companies that offer products and
services that compete with the zNose(R) in our markets. We believe that
manufacturers of X-Rays, Ion Mobility Spectrometers, and other electronic noses
compete with us in the security-related markets. In the markets for instruments
that analyze chemicals, we compete with many manufacturers including
Perkin-Elmer (PKI:NYSE) and Agilent Technologies (A: NYSE). Many of our existing
and potential competitors have longer operating histories, greater experience,
greater name recognition, larger customer bases and significantly greater
financial, technical and marketing resources than we do. Because of their
greater resources, our competitors are able to undertake more extensive
marketing campaigns for their products and services, and make more attractive
offers to potential employees, strategic partners, and others. We may not be
able to compete successfully against our current or future competitors and our
business and financial results could suffer from such competition.


                                       -3-

IF OUR PRODUCTS DO NOT ACHIEVE A SIGNIFICANT LEVEL OF MARKET ACCEPTANCE, IT IS
HIGHLY UNLIKELY THAT WE EVER WILL BECOME PROFITABLE.

        To our knowledge, electronic nose technology, and our zNose(R) product,
has yet to receive widespread market acceptance in the markets we are focused
on. The commercial success of our current and future products will depend upon
the adoption of our zNose(R) technology by our customers. In order to be
successful, our future products must meet the technical and cost requirements
for the markets we intend to penetrate. Market acceptance will depend on many
factors, including:

     o  our ability to convince potential customers to adopt our
        products;

     o  the willingness and ability of potential customers to adopt our
        products;

     o  our ability to sell and service sufficient quantities of our
        products; and

     o  new, advanced technology offered by other companies which
        compete with our products.

        Because of these and other factors, our products may not achieve market
acceptance. If our products do not achieve a significant level of market
acceptance, demand for our future products will not develop as expected and it
is highly unlikely that we ever will become profitable.

OTHER COMPANIES COULD CREATE A TECHNOLOGY WHICH COMPETES EFFECTIVELY WITH OUR
ZNOSE(R) TECHNOLOGY, AND WE MAY BE UNABLE TO MAINTAIN OUR EXISTING, OR CAPTURE
ADDITIONAL, MARKET SHARE IN OUR MARKETS.

        Based upon our review of the industry, we are unaware of any company
today that markets a technology which is similar to our zNose(R) technology.
Nonetheless, our intended markets generally are dominated by very large
corporations (or their subsidiaries), which have greater access to capital,
manpower, technical expertise, distribution channels and other elements which
would give them a competitive advantage over us were they to begin to compete
directly against us. It is possible that these and other competitors may
implement new, advanced technologies before we are able to, allowing them to
provide more effective products at more competitive prices. Any number of future
technological developments could:

     o  adversely impact our competitive position;

     o  require write-downs of obsolete technology;

     o  require us to discontinue production of obsolete products before
        we can recover any or all of our related research, development
        and commercialization expenses; or

     o  require significant capital expenditures beyond those currently
        contemplated.

        We cannot assure investors that we will be able to achieve the
technological advances to remain competitive and profitable, that new products
and services will be developed and manufactured on schedule or on a
cost-effective basis, that anticipated markets will exist or develop for new
products or services, or that any marketed product will not become
technologically obsolete.

WE DEPEND ON KEY PERSONNEL IN A COMPETITIVE MARKET FOR SKILLED EMPLOYEES, AND
FAILURE TO RETAIN AND ATTRACT QUALIFIED PERSONNEL COULD SUBSTANTIALLY HARM OUR
BUSINESS.

        We believe that our future success will depend in large part on our
ability to attract and retain highly skilled engineering, sales and marketing
and management personnel. If we are unable to hire the necessary personnel, the
development of our business will likely be delayed or prevented. Competition for
these highly skilled employees is intense. As a result, we cannot assure you
that we will be successful in retaining our key personnel or in attracting and
retaining the personnel we require for expansion.

                                       -4-



WE ARE DEPENDENT UPON A MAJOR CUSTOMER FOR A LARGE PERCENTAGE OF OUR SALES AND
ANY CHANGES TO THAT CUSTOMER'S BUSINESS OR OUR RELATIONSHIP WITH THAT CUSTOMER
COULD HAVE A SUBSTANTIAL EFFECT ON OUR SALES AND REVENUE.

        Our largest customer is Beijing R&D Technology Co., Ltd., which is our
exclusive distributor in China. During the fiscal year ending December 31, 2005,
purchases by Beijing R&D Technology accounted for $601,000, or approximately 29%
of our total sales. We expect that in the upcoming fiscal year, Beijing R&D
Technology will continue to account for a large percentage of our total sales.
If Beijing R&D Technology experiences any changes in its business that affect
its level of purchases from Electronic Sensor Technology, or if there is any
change in the business relationship between Beijing R&D Technology and
Electronic Sensor Technology leading to a decrease in its level of purchases
from Electronic Sensor Technology, our sales and revenues could substantially
decrease.


WE MAY NOT BE ABLE TO PROTECT OUR INTELLECTUAL PROPERTY AND MAY INFRINGE ON THE
INTELLECTUAL PROPERTY RIGHTS OF OTHERS.

        The protection of our intellectual property, including our patents and
other proprietary rights, is important to our success and our competitive
position. Accordingly, we devote substantial resources to the maintenance and
protection of intellectual property through various methods such as patents and
patent applications, trademarks, copyrights, confidentiality and non-disclosure
agreements. We also rely on trade secrets, proprietary methodologies and
continuing technological innovation to remain competitive. We have taken
measures to protect our trade secrets and know-how, including the use of
confidentiality agreements with our employees. However, it is possible that
these agreements may be breached and that the available remedies for any breach
will not be sufficient to compensate us for damages incurred.


        We currently have four patents in the United States and patents in
various foreign countries. There can be no assurance that the patents that we
hold will protect us from competition from third parties with similar
technologies or products, as it is possible that third parties may be able to
develop similar technologies or products without necessarily infringing on the
patents that we currently hold. Moreover, we cannot assure you that others will
not assert rights in, or ownership of, patents and other proprietary rights we
may establish or acquire or that we will be able to successfully resolve such
conflicts. We do not have reason to believe that our current patents are at
great risk of being challenged, however, due to the nature and complexity of our
technology, we cannot assure you that any patents issued to us will not be
challenged, invalidated or circumvented or that the rights granted under these
patents will provide a competitive advantage to us. Moreover, the laws of some
foreign countries do not protect intellectual property rights to the same extent
as the laws of the United States, and we could experience various obstacles and
high costs in protecting our intellectual property rights in foreign countries.
If we are unable to obtain or maintain these protections, we may not be able to
prevent third parties from using our intellectual property.


RISKS RELATED TO OWNERSHIP OF OUR COMMON STOCK

OUR STOCK PRICE IS SUBJECT TO EXTREME VOLATILITY.

        The trading price of our common stock has been, and is likely to
continue to be, highly volatile and could be subject to wide fluctuations in
response to factors such as actual or anticipated variations in our quarterly
operating results, announcements of technological innovations, announcements of
significant new orders or cancellation of significant orders, or new products by
Electronic Sensor Technology or its competitors, changes in financial estimates
by securities analysts, conditions or trends in the analytic instrumentation
markets, changes in the market valuations of other security-detection oriented
companies, announcements by Electronic Sensor Technology or its competitors of
significant acquisitions, strategic partnerships, joint ventures or capital
commitments, additions or departures of key personnel, sales of common stock or
other securities of Electronic Sensor Technology in the open market and other
events or factors, many of which are beyond our control.


                                       -5-


THERE IS NO ESTABLISHED TRADING MARKET FOR OUR SHARES OF COMMON STOCK. THE
LIQUIDITY OF OUR COMMON STOCK WILL BE AFFECTED BY ITS LIMITED TRADING MARKET.


        Bid and ask prices for our common stock are quoted on the
Over-the-Counter Bulletin Board under the symbol "ESNR:OB." There is currently
no broadly followed, established trading market for our common stock. An
established trading market for our shares may never develop or be maintained.
Active trading markets generally result in lower price volatility and more
efficient execution of buy and sell orders. The absence of an active trading
market reduces the liquidity of our shares. Prior to the consummation of the
merger in February 2005, we had no reported trading volume in our common stock.
Since then, we have had sporadic reported trading in our shares. As a result of
this sporadic trading activity, the quoted price for our common stock on the
Over-the-Counter Bulletin Board is not necessarily a reliable indicator of its
fair market value. Further, if we cease to be quoted, holders would find it more
difficult to dispose of, or to obtain accurate quotations as to the market value
of, our common stock, and the market value of our common stock would likely
decline.


IF AND WHEN A TRADING MARKET FOR OUR COMMON STOCK DEVELOPS, BECAUSE WE ARE A
TECHNOLOGY COMPANY, WE EXPECT THAT THE TRADING PRICES WILL BE EXTREMELY
VOLATILE.

        The trading prices of technology company stocks in general tend to
experience extreme price fluctuations. The valuations of many technology
companies without consistent product revenues or earnings, if any, are not based
on conventional valuation standards such as price to earnings and price to sales
ratios. Any negative change in the public's perception of the prospects of
technology companies could depress our stock price regardless of our results of
operations if a trading market for our stock develops. In addition, our stock
price could be subject to wide fluctuations in response to factors including,
but not limited to, the following:

     o  announcements of new technological innovations or new products
        by us or our competitors;

     o  conditions or trends in the sensor technology industry;

     o  changes in the market valuations of other technology companies;

     o  developments in domestic and international governmental policy
        or regulations that affect the technology utilized in our
        products;

     o  announcements by us or our competitors of significant
        acquisitions, strategic partnerships, joint ventures or capital
        commitments;

     o  developments in patent or other proprietary rights held by us or
        by others; or

     o  loss or expiration of our intellectual property rights.

WE MAY RAISE ADDITIONAL CAPITAL THROUGH A SECURITIES OFFERING THAT COULD DILUTE
THE OWNERSHIP INTERESTS OF OUR SHAREHOLDERS.

        We require substantial working capital to fund our business. If we raise
additional funds through the issuance of equity, equity-related or convertible
debt securities, these securities may have rights, preferences or privileges
senior to those of the holders of our common stock. The issuance of additional
common stock or securities convertible into common stock by our management will
also have the effect of further diluting the proportionate equity interest and
voting power of holders of our common stock.


        In addition, under our articles of incorporation, our Board of Directors
is authorized to issue, without obtaining shareholder approval, shares of
preferred stock having the rights, privileges and is designated as determined by
the Board of Directors. Therefore, the Board of Directors could issue shares of
preferred stock that


                                       -6-


would have preferential liquidation, distribution, voting, dividend or other
rights, which would be superior to the rights of common stockholders.

A SIGNIFICANT NUMBER OF OUR SHARES ARE ELIGIBLE FOR SALE, AND THEIR SALE COULD
DEPRESS THE MARKET PRICE OF OUR COMMON STOCK.


        Sales of a significant number of shares of our common stock in the open
market could harm the market price of our common stock. A reduced market price
for our shares could make it more difficult to raise funds through future
offerings of common stock. Approximately 27 million shares are presently
eligible for trading in the open market. As additional shares become available
for resale in the open market, including new shares issued upon conversion of
our debentures issued on December 7, 2005, the exercise of our outstanding
options, warrants, and contractual obligations to issue shares, the number of
our publicly tradable shares will increase, which could decrease their trading
price. In addition, some of our shares may be offered from time to time in the
open market pursuant to Rule 144, and these sales may have a depressive effect
on the market for our shares. In general, a person who has held restricted
shares for a period of one year may, upon satisfying certain conditions to the
application of Rule 144, sell into the market shares up to an amount equal to 1%
of the outstanding shares (and potentially more) of our common stock. These
sales may be repeated once each three months. In addition, an unlimited amount
of restricted shares may be sold by a non-affiliate after they have been held
for two years pursuant to Rule 144(k).

WE ARE NOT REQUIRED TO FILE REPORTS WITH THE SEC ON A CONTINUOUS BASIS BECAUSE
OUR STOCK IS NOT REGISTERED UNDER THE EXCHANGE ACT.

        Our registered common stock is registered under the Securities Act and
is not registered under the Exchange Act. Because of this, our our duty to file
reports with the SEC is automatically suspended for any fiscal year, other than
a fiscal year within which a registration statement that we filed became
effective, and we have less than 300 record holders of our shares at the
beginning of such fiscal year. We presently have substantially below 300 record
holders of our shares. Although we have chosen to continue such reporting with
the SEC on a voluntary basis in the past and intend to continue to do so in the
immediate future, we will have no legal obligation to file reports with the SEC
beginning in the fiscal year following the fiscal year in which this
registration statement is declared effective, provided we continue to have less
than 300 record holders of our shares.

WE ARE SUBJECT TO THE SEC'S PENNY STOCK RULES.

        Broker-dealer practices in connection with transactions in "penny
stocks" are regulated by certain rules adopted by the SEC. Penny stocks
generally are equity securities with a price of less than $5.00, other than
securities registered on certain national securities exchanges or quoted on the
NASDAQ Stock Market if current price and volume information with respect to
transactions in such securities is provided by the exchange or system. The rules
require that a broker-dealer, prior to a transaction in a penny stock not
otherwise exempt from the rules, deliver a standardized risk disclosure document
that provides information about penny stocks and the risks in the penny stock
market. The broker-dealer also must provide the customer with current bid and
offer quotations for the penny stock, the compensation of the broker-dealer and
its salesperson in connection with the transaction and monthly account
statements showing the market value of each penny stock held in the customer's
account. In addition, the rules generally require that prior to a transaction in
a penny stock, the broker-dealer must make a special written determination that
the penny stock is a suitable investment for the purchaser and receive the
purchaser's written agreement to the transaction. These disclosure requirements
may have the effect of reducing the liquidity of penny stocks. Our securities
are subject to the penny stock rules. As such, holders of our shares of common
stock may find it more difficult to sell their securities.


WE HAVE NOT PAID DIVIDENDS IN THE PAST AND DO NOT EXPECT TO PAY DIVIDENDS IN THE
FUTURE. ANY RETURN ON INVESTMENT MAY BE LIMITED TO POTENTIAL FUTURE APPRECIATION
IN THE VALUE OF OUR STOCK.


        We have never paid cash dividends on our stock and do not anticipate
paying cash dividends on our stock in the foreseeable future. The payment of
dividends on our shares, if ever, will depend on our earnings, financial
condition and other business and economic factors affecting us at such time as
the Board of Directors may consider


                                       -7-


relevant. If we do not pay dividends, our stock may be less valuable because a
return on investment will only occur if and to the extent that our stock price
appreciates, and if the price of our stock does not appreciate, then there will
be no return on investment.

OUR ANTI-TAKEOVER DEFENSE PROVISIONS MAY DETER POTENTIAL ACQUIRERS AND DEPRESS
OUR STOCK PRICE.


        Certain provisions of our articles of incorporation, bylaws and Nevada
law could be used by our incumbent management to make it substantially more
difficult for a third party to acquire control of us. These provisions include
the following:


     o  we may issue preferred stock with rights senior to those of our
        common stock; and


     o  the Board of Directors may fill casual vacancies occurring in
        the Board of Directors and may appoint one or more additional
        directors between annual meetings of shareholders to hold office
        until the next annual meeting of shareholders.


        These provisions may discourage certain types of transactions involving
an actual or potential change in control. These provisions may also limit our
shareholders' ability to approve transactions that they may deem to be in their
best interests and discourage transactions in which our shareholders might
otherwise receive a premium for their shares over the then current market price.

SOME OF OUR EXISTING SHAREHOLDERS CAN EXERT CONTROL OVER US, AND MAY NOT MAKE
DECISIONS THAT ARE IN THE BEST INTERESTS OF ALL SHAREHOLDERS.


        Our officers, directors and principal shareholders together control
approximately 43.4% of our outstanding common stock. Land & General Berhad
through its wholly owned subsidiary, L&G Resources (1994), Inc., owns
approximately 18.4% of our outstanding common stock. As a result, these
shareholders, if they act together, will be able to exert a significant degree
of influence over our management and affairs and over matters requiring
shareholder approval, including the election of directors and approval of
significant corporate transactions. In addition, this concentration of ownership
may delay or prevent a change in control of Electronic Sensor Technology and
might affect the market price of our shares, even when a change may be in the
best interests of all shareholders. Moreover, the interests of this
concentration of ownership may not always coincide with our interests or the
interests of other shareholders, and, accordingly, they could cause us to enter
into transactions or agreements which we would not otherwise consider.

SHAREHOLDERS REPRESENTING A SMALL NUMBER OF OUR SHARES MAY TAKE SHAREHOLDER
ACTION THAT WOULD AFFECT ALL SHAREHOLDERS.

        Our bylaws provide that two persons present and being, or representing
by proxy, shareholders constitutes a quorum for purposes of shareholder
meetings. To the extent that action may be taken by a majority of our shares
that are present at a shareholder's meeting for which a quorum exists, a small
number of shares could take shareholder action that would affect all
shareholders (for example, the election of directors).


PAST ACTIVITIES OF THE COMPANY AND ITS AFFILIATES MAY LEAD TO FUTURE LIABILITY
FOR US.


        Prior to the acquisition of Electronic Sensor Technology, L.P., we
engaged in the exploitation of mining claims, a business unrelated to Electronic
Sensor Technology's current operations. Although we are unaware of any at this
time, liabilities, if any, of the prior business may have a material adverse
effect on us. These liabilities potentially may include liabilities relating to
Bluestone's operations of its mining business, individuals that Bluestone
employed, contracts to which Bluestone was a party, any personal injury claims
against Bluestone and any other liabilities that may arise as a result of
operating a publicly-traded mining business.


                                       -8-


                                 USE OF PROCEEDS


        We will not receive any proceeds from the resale by the selling security
holders of the common stock registered pursuant to this registration statement.


                         DETERMINATION OF OFFERING PRICE


        There is currently no broadly followed, established trading market for
our common stock. Each selling security holder and any of their pledgees,
assignees and successors-in-interest may, from time to time, sell any or all of
their shares of common stock on through the OTC Bulletin Board or any stock
exchange, market or trading facility on which the shares are traded (if we ever
become eligible for trading on any stock exchange, market or trading facility
and seek a listing or quotation thereon) or in private transactions. These sales
may be at fixed prices or negotiated prices, as determined by the selling
security holder.

                            SELLING SECURITY HOLDERS


        The table below sets forth the following information, as of the date
that we received such information from the selling security holder (this
information was received by Electronic Sensor Technology between December 6,
2005 and the date of this prospectus):

            o  the name of each beneficial owner of the common stock
               registered pursuant to this registration statement;

            o  the number of shares of common stock that each selling
               security holder beneficially owns as of such date;


            o  the number of shares of common stock that may, assuming
               the exercise in full of all of the warrants described
               above and the conversion in full of all of the
               debentures described above, be offered for sale by each
               selling security holder from time to time pursuant to
               this prospectus;

            o  the number of shares of common stock to be beneficially
               owned by each selling security holder assuming the
               exercise in full of all of the warrants described above
               and the conversion in full of all of the debentures
               described above, and the sale of all of the shares of
               common stock offered hereby; and

            o  by footnote, any position or office held or other
               material relationship with Electronic Sensor Technology
               or any of its predecessors or affiliates within the past
               three years, other than that of being a shareholder, and
               details regarding the transaction in which each selling
               security holder acquired beneficial ownership of its
               common stock.

        Of the selling security holders, we understand that Montgomery & Co. LLC
is registered as a broker-dealer with the NASD, California, Connecticut,
Florida, Massachusetts, Nevada, New York and Washington. Otherwise, to our
knowledge, none of the selling security holders is a broker-dealer or an
affiliate of a broker-dealer.


                                       -9-






                                               SHARES OF                                  SHARES OF COMMON STOCK
                                                COMMON          NUMBER OF SHARES          OWNED OF RECORD AFTER
                                                 STOCK           OF COMMON STOCK        COMPLETION OF  THE OFFERING
                                                OWNED OF        TO BE OFFERED FOR   -------------------------------------
                                                 RECORD           THE SELLING
                                              PRIOR TO THE      SECURITY HOLDER'S
NAME OF SELLING SECURITY HOLDER                 OFFERING            ACCOUNT             NUMBER            PERCENTAGE
-----------------------------------------   -----------------   -----------------   -----------------   -----------------
                                                                                      
Mark Angelo                                                 0       1,000,000 (1)                   0                   *
Mark S. Barbara (2)                                         0          50,000 (3)                   0                   *
Brian Bean                                                  0         485,213 (4)                   0                   *
Bixbie Financial Corp. (5)                                  0            250,000                    0                   *
John J. and Alicia C. Caufield (6)                     30,000         100,000 (7)              30,000                   *
CEOcast, Inc. (8)                                     130,000            130,000                    0                   *
Richard Chase                                               0          50,000 (9)                   0                   *
Chase Investments, Inc. (10)                                0             50,000                    0                   *
Crown Capital Partners SA (11)                              0      1,000,000 (12)                   0                   *
John Graham Douglas                                         0      1,000,000 (13)                   0                   *
Richard Forte (14)                                          0         50,000 (15)                   0                   *
Rachel Glicksman                                   130,000(16)       130,000 (16)                   0                   *
Jeffrey R. Haines (17)                                      0             50,000                    0                   *
Leon Hamerling                                              0        350,000 (18)                   0                   *
Highgate House Funds, Ltd. (19)                             0      1,000,000 (20)                   0                   *
HomelandSecurityStocks.com, a division of
 Protect-A-Life, Inc. (21)                                  0        350,000 (22)                   0                   *
Islandia, L.P. (23)                                         0      7,520,990 (24)                   0                   *
Nathaniel Kramer (25)                                       0         50,000 (26)                   0                   *
Allan Meiteen                                               0        250,000 (27)                   0                   *
Memphis Group Inc. (28)                                     0        500,000 (29)                   0                   *
Midsummer Investment Ltd. (30)                              0      3,537,780 (31)                   0                   *
George Montgomery                                           0        485,213 (32)                   0                   *
Jamie Montgomery                                            0        485,213 (33)                   0                   *
Michael Montgomery                                          0        485,213 (34)                   0                   *
Montgomery & Associates                                     0        485,213 (35)                   0                   *
Montgomery & Co., LLC (36)                                  0        485,213 (37)                   0                   *
J. Robert Paul                                              0        350,000 (38)                   0                   *
Jeremy Shaffer Roenick (39)                                 0         50,000 (40)                   0                   *
Gene Salkind, M.D. (41)                                     0        200,000 (42)                   0                   *
Kenneth D. Sgro                                    130,000(43)       130,000 (43)                   0                   *
Brian Patrick Shanahan (44)                                 0             50,000                    0                   *
Jeffrey Shear                                               0        500,000 (45)                   0                   *
Paul Tompkins (46)                                          0             25,000                    0                   *



* Less than 1%.


(1)    Includes 1,000,000 shares of common stock beneficially owned by Highgate
       House Funds, Ltd. of which Mr. Angelo is a beneficial owner by virtue of
       his position as Portfolio Manager of Highgate House Funds, Ltd.

(2)    Mark S. Barbara acquired beneficial ownership of his shares in a private
       offering on February 1, 2005 in which we issued 3,985,000 shares of
       common stock of Electronic Sensor Technology and three-year warrants to
       purchase 3,985,000 shares of our common stock at an exercise price of
       $1.00 per share (units consisting of one share of common stock and one
       warrant were sold for $1.00 per unit). The purchase price of the units
       and exercise price of the warrants were based upon a valuation of
       Electronic Sensor Technology, L.P. of $20 million, divided by
       20,000,000, which represents the total number of limited partnership
       interests of Electronic Sensor Technology, L.P. outstanding immediately
       prior to the merger whereby Electronic Sensor Technology, L.P. became an
       indirect subsidiary of Electronic Sensor Technology, Inc.

(3)    Includes 25,000 shares of common stock underlying a warrant exercisable
       within 60 days of January 31, 2006.

(4)    Includes 485,213 shares of common stock beneficially owned by Montgomery
       & Co., LLC of which Mr. Bean is a beneficial owner by virtue of his
       position as a control person of Montgomery & Co.

(5)    Bixbie Financial Corp. acquired beneficial ownership of its shares in
       the February 1, 2005 private offering described above in footnote 2.


                                      -10-



(6)    John J. and Alicia C. Caufield acquired beneficial ownership of their
       shares in the February 1, 2005 private offering described above in
       footnote 2.

(7)    Includes 50,000 shares of common stock underlying a warrant exercisable
       within 60 days of January 31, 2006.

(8)    CEOcast provides us with investor relations services valued at
       approximately $17,500 per month. We have entered into three short-term
       consulting agreements with CEOcast on each of January 17, 2005, July 17,
       2005 and October 17, 2005, pursuant to which we agreed to compensate
       CEOcast with $7,500 per month, paid in cash, and CEOcast is compensated
       for the remainder of the value of its services with our common stock. We
       issued 130,000 shares of common stock to CEOcast on December 5, 2005, in
       a private offering, in exchange for investor relations services valued
       at approximately $105,882. Such shares represented the compensation in
       our shares due to CEOcast under the three consulting agreements. The
       number of shares issued to CEOcast was calculated by determining for
       each of the nine months of the contract between us and CEOcast that
       number of shares that could be purchased per month at a 15% discount
       with $10,000.

(9)    Includes 50,000 shares of common stock beneficially owned by Chase
       Investments, Inc. of which Mr. Chase is a beneficial owner by virtue of
       his position as sole control person of Chase Investments, Inc.

(10)   Chase Investments, Inc. acquired beneficial ownership of its shares in
       the February 1, 2005 private offering described above in footnote 2.

(11)   Crown Capital Partners SA acquired beneficial ownership of its shares in
       the February 1, 2005 private offering described above in footnote 2.

(12)   Includes 500,000 shares of common stock underlying a warrant exercisable
       within 60 days of January 31, 2006.

(13)   Includes 1,000,000 shares of common stock beneficially owned by Crown
       Capital Partners SA of which Mr. Douglas is a beneficial owner by virtue
       of his position as sole control person of Crown Capital Partners SA.

(14)   Richard Forte acquired beneficial ownership of his shares in the
       February 1, 2005 private offering described above in footnote 2.

(15)   Includes 25,000 shares of common stock underlying a warrant exercisable
       within 60 days of January 31, 2006.

(16)   Includes 130,000 shares of common stock held by CEOcast, Inc. of which
       Ms. Glicksman is a beneficial owner by virtue of her position as a
       principal shareholder of CEOcast.

(17)   Jeffrey R. Haines acquired beneficial ownership of his shares in the
       February 1, 2005 private offering described above in footnote 2.

(18)   Includes 350,000 shares of common stock beneficially owned by
       HomelandSecurityStocks.com, a division of Protect-A-Life, Inc. of which
       Mr. Hamerling is a beneficial owner by virtue of his position as a 50%
       shareholder of Protect-A-Life.

(19)   Highgate House Funds, Ltd. acquired beneficial ownership of its shares
       in the February 1, 2005 private offering described above in footnote 2.

(20)   Includes 500,000 shares of common stock underlying a warrant exercisable
       within 60 days of January 31, 2006.


                                      -11-



(21)   HomelandSecurityStocks, a division of Protect-A-Life, Inc., formerly
       provided us with investor relations services. On December 5, 2005, in a
       private offering, HomelandSecurityStocks.com was issued a warrant to
       purchase 350,000 shares of common stock at an exercise price of $2.40
       per share, pursuant to a Settlement Agreement entered into on October
       11, 2005 among HomelandSecurityStocks, Protect-A-Life and Electronic
       Sensor Technology. The Settlement Agreement settled a dispute between
       HomelandSecurityStocks and Electronic Sensor Technology resulting from
       the termination by Electronic Sensor Technology of a consulting
       agreement dated February 7, 2005, between HomelandSecurityStocks and
       Electronic Sensor Technology. Pursuant to the consulting agreement, we
       had engaged HomelandSecurityStocks to provide us with investor relations
       and public relations services from February 9, 2005 through February 9,
       2006 for a fee of $12,000 per month and warrants to purchase 500,000
       shares of common stock at an exercise price of $2.40 per share, to vest
       as follows: (i) warrants to purchase 200,000 shares on February 9, 2005,
       (ii) warrants to purchase 75,000 shares on May 9, 2005, (iii) warrants
       to purchase 75,000 shares on August 9, 2005, (iv) warrants to purchase
       75,000 shares on November 9, 2005 and (v) warrants to purchase 75,000
       shares on February 8, 2006. Electronic Sensor Technology terminated the
       consulting agreement in July 2005.

(22)   Includes 350,000 shares of common stock underlying a warrant exercisable
       within 60 days of January 31, 2006.

(23)   The general partner of Islandia is John Lang, Inc., a New York Sub-S
       corporation formed to manage investments. By virtue of this relationship
       John Lang, Inc. may be deemed to have indirect beneficial ownership of
       the shares of common stock beneficially owned by Islandia; however, John
       Lang, Inc. disclaims beneficial ownership of the shares of common stock
       beneficially owned by Islandia.

       Islandia acquired beneficial ownership of its shares in a private
       offering on December 7, 2005, wherein we offered to Islandia and
       Midsummer an aggregate principal amount of $7,000,000 of 8% unsecured
       convertible debentures due December 7, 2009 that are convertible into
       15,404,930 shares of our common stock. The debentures are convertible
       into common stock at an exercise price of $0.4544 per share. This price
       was calculated based upon 105% of the volume weighted average price over
       the 20 trading days preceding the date of issuance of the debentures.
       Under certain circumstances, we have the right, at our option to pay
       interest on the debentures with shares of common stock. In connection
       with the private offering, we agreed to register 130% of the common
       stock into which the debentures are convertible plus 130% of the common
       stock that we may use to pay interest on the debentures. On this
       registration statement, we are registering 110% of such shares, or
       21,058,770 shares, to facilitate secondary trading by the holders of the
       debentures.

(24)   Includes 110% of 5,501,761 shares of common stock underlying a debenture
       convertible within 60 days of January 31, 2006, plus 110% of 1,335,502
       shares of common stock that may be used to pay interest on the
       debenture.

(25)   Nathaniel Kramer acquired beneficial ownership of his shares in the
       February 1, 2005 private offering described above in footnote 2.

(26)   Includes 25,000 shares of common stock underlying a warrant exercisable
       within 60 days of January 31, 2006.

(27)   Includes 250,000 shares of common stock beneficially owned by Bixbie
       Financial Corp. of which Mr. Meiteen is a beneficial owner by virtue of
       his position as sole control person of Bixbie Financial Corp.

(28)   Memphis Group Inc. acquired beneficial ownership of its shares in the
       February 1, 2005 private offering described above in footnote 2.

(29)   Includes 250,000 shares of common stock underlying a warrant exercisable
       within 60 days of January 31, 2006.


                                      -12-



(30)   Midsummer Capital, LLC, a New York limited liability company, serves as
       investment advisor to Midsummer Investment Ltd., a Bermuda company. By
       reason of such relationships, Midsummer Capital may be deemed to share
       dispositive power over the shares of common stock beneficially owned by
       Midsummer Investment. Midsummer Capital disclaims beneficial ownership
       of such shares of common stock. Michel A. Amsalem and Scott D. Kaufman
       are members of Midsummer Capital. By reason of such relationships, Mr.
       Amsalem and Mr. Kaufman may be deemed to share dispositive power over
       the shares of common stock stated as beneficially owned by Midsummer
       Investment. Mr. Amsalem and Mr. Kaufman disclaim beneficial ownership of
       such shares of common stock.

       Midsummer acquired beneficial ownership of its shares in the December 7,
       2005 transaction described above in footnote 23.

(31)   Includes 110% of 9,903,169 shares of common stock underlying a debenture
       convertible within 60 days of January 31, 2006, plus 110% of 2,403,903
       shares of common stock that may be used to pay interest on the
       debenture.

(32)   Includes 485,213 shares of common stock beneficially owned by Montgomery
       & Co., LLC of which Mr. Montgomery is a beneficial owner by virtue of
       his position as a control person of Montgomery & Co.

(33)   Includes 485,213 shares of common stock beneficially owned by Montgomery
       & Co., LLC of which Mr. Montgomery is a beneficial owner by virtue of
       his position as a control person of Montgomery & Co. In addition, Mr.
       Montgomery is an indirect beneficial owner of such shares of common
       stock by virtue of his position as sole control person of Montgomery &
       Associates, another beneficial owner of the shares of common stock
       beneficially owned by Montgomery & Co.

(34)   Includes 485,213 shares of common stock beneficially owned by Montgomery
       & Co., LLC of which Mr. Montgomery is a beneficial owner by virtue of
       his position as a control person of Montgomery & Co.

(35)   Includes 485,213 shares of common stock beneficially owned by Montgomery
       & Co., LLC of which Montgomery & Associates is a beneficial owner by
       virtue of its position as a control person of Montgomery & Co.

(36)   Montgomery & Co., LLC provided us with financial advisory services in
       connection with the issuance of the 8% unsecured convertible debentures
       issued on December 7, 2005 and various other securities, for which it
       received $490,000 and a five-year warrant to purchase 485,213 shares of
       common stock at an exercise price of $0.4761 per share. This price was
       calculated based upon 110% of the volume weighted average price over the
       20 trading days preceding the date of issuance of the warrant.

(37)   Includes 485,213 shares of common stock underlying a warrant exercisable
       within 60 days of January 31, 2006.

(38)   Includes 350,000 shares of common stock beneficially owned by
       HomelandSecurityStocks.com, a division of Protect-A-Life, Inc. of which
       Mr. Paul is a beneficial owner by virtue of his position as a 50%
       shareholder of Protect-A-Life.

(39)   Jeremy Schaffer Roenick acquired beneficial ownership of his shares in
       the February 1, 2005 private offering described above in footnote 2.

(40)   Includes 25,000 shares of common stock underlying a warrant exercisable
       within 60 days of January 31, 2006.

(41)   Gene Salkind, MD acquired beneficial ownership of his shares in the
       February 1, 2005 private offering described above in footnote 2.


                                      -13-



(42)   Includes 100,000 shares of common stock underlying a warrant exercisable
       within 60 days of January 31, 2006.

(43)   Includes 130,000 shares of common stock held by CEOcast, Inc. of which
       Mr. Sgro is a beneficial owner by virtue of his position as a principal
       shareholder of CEOcast.

(44)   Brian Patrick Shanahan acquired beneficial ownership of his shares in
       the February 1, 2005 private offering described above in footnote 2.

(45)   Includes 500,000 shares of common stock beneficially owned by Memphis
       Group Inc. of which Mr. Shear is a beneficial owner by virtue of his
       position as sole control person of Memphis Group Inc.

(46)   Paul Tompkins acquired beneficial ownership of his shares in the
       February 1, 2005 private offering described above in footnote 2.


                              PLAN OF DISTRIBUTION

        Each selling security holder and any of their pledgees, assignees and
successors-in-interest may, from time to time, sell any or all of their shares
of common stock on through the OTC Bulletin Board or any other stock exchange,
market or trading facility on which the shares are traded or in private
transactions. These sales may be at fixed or negotiated prices. A selling
security holder may use any one or more of the following methods when selling
shares:

            o   ordinary brokerage transactions and transactions in
                which the broker-dealer solicits purchasers;

            o   block trades in which the broker-dealer will attempt to
                sell the shares as agent but may position and resell a
                portion of the block as principal to facilitate the
                transaction;

            o   purchases by a broker-dealer as principal and resale by
                the broker-dealer for its account;

            o   an exchange distribution in accordance with the rules of
                the applicable exchange;

            o   privately negotiated transactions;

            o   settlement of short sales entered into after the
                effective date of the registration statement of which
                this prospectus is a part;

            o   broker-dealers may agree with the selling security
                holders to sell a specified number of such shares at a
                stipulated price per share;

            o   a combination of any such methods of sale;

            o   through the writing or settlement of options or other
                hedging transactions, whether through an options
                exchange or otherwise; or

            o   any other method permitted pursuant to applicable law.



        The selling security holders may also sell shares under Rule 144 under
the Securities Act of 1933, as amended, if available, rather than under this
prospectus.


        Broker-dealers engaged by the selling security holders may arrange for
other brokers-dealers to participate in sales. Broker-dealers may receive
commissions or discounts from the selling security holders (or, if any
broker-dealer acts as agent for the purchaser of shares, from the purchaser) in
amounts to be negotiated, but, except

                                      -14-


as set forth in a supplement to this prospectus, in the case of an agency
transaction not in excess of a customary brokerage commission in compliance with
NASDR Rule 2440; and in the case of a principal transaction a markup or markdown
in compliance with NASDR IM-2440.

        In connection with the sale of the common stock or interests therein,
the selling security holders may enter into hedging transactions with
broker-dealers or other financial institutions, which may in turn engage in
short sales of the common stock in the course of hedging the positions they
assume. The selling security holders may also sell shares of the common stock
short and deliver these securities to close out their short positions, or loan
or pledge the common stock to broker-dealers that in turn may sell these
securities. The selling security holders may also enter into option or other
transactions with broker-dealers or other financial institutions or the creation
of one or more derivative securities which require the delivery to such
broker-dealer or other financial institution of shares offered by this
hprospectus, which shares such broker-dealer or other financial institution may
resell pursuant to this prospectus (as supplemented or amended to reflect such
transaction).


        The selling security holders and any broker-dealers or agents that are
involved in selling the shares may be deemed to be "underwriters" within the
meaning of the Securities Act in connection with such sales. In such event, any
commissions received by such broker-dealers or agents and any profit on the
resale of the shares purchased by them may be deemed to be underwriting
commissions or discounts under the Securities Act. Each selling security holder
has informed us that it does not have any written or oral agreement or
understanding, directly or indirectly, with any person to distribute the common
stock. In no event shall any broker-dealer receive fees, commissions and markups
which, in the aggregate, would exceed eight percent (8%).

        Electronic Sensor Technology is required to pay certain fees and
expenses incurred by Electronic Sensor Technology incident to the registration
of the shares. Electronic Sensor Technology has agreed to indemnify the selling
security holders against certain losses, claims, damages and liabilities,
including liabilities under the Securities Act.


        Because selling security holders may be deemed to be "underwriters"
within the meaning of the Securities Act, they will be subject to the prospectus
delivery requirements of the Securities Act. In addition, any securities covered
by this prospectus which qualify for sale pursuant to Rule 144 under the
Securities Act may be sold under Rule 144 rather than under this prospectus.
Each selling security holder has advised us that they have not entered into any
written or oral agreements, understandings or arrangements with any underwriter
or broker-dealer regarding the sale of the resale shares. There is no
underwriter or coordinating broker acting in connection with the proposed sale
of the resale shares by the selling security holders.

        We agreed to keep this prospectus effective until the earlier of (i) the
date on which the shares may be resold by the selling security holders without
registration and without regard to any volume limitations by reason of Rule
144(e) under the Securities Act or any other rule of similar effect or (ii) all
of the shares have been sold pursuant to the prospectus or Rule 144 under the
Securities Act or any other rule of similar effect. The resale shares will be
sold only through registered or licensed brokers or dealers if required under
applicable state securities laws. In addition, in certain states, the resale
shares may not be sold unless they have been registered or qualified for sale in
the applicable state or an exemption from the registration or qualification
requirement is available and is complied with.

        Under applicable rules and regulations under the Exchange Act, any
person engaged in the distribution of the resale shares may not simultaneously
engage in market making activities with respect to the common stock for the
applicable restricted period, as defined in Regulation M, prior to the
commencement of the distribution. In addition, the selling security holders will
be subject to applicable provisions of the Exchange Act and the rules and
regulations thereunder, including Regulation M, which may limit the timing of
purchases and sales of shares of the common stock by the selling security
holders or any other person. We will make copies of this prospectus available to
the selling security holders and have informed them of the need to deliver a
copy of this prospectus to each purchaser at or prior to the time of the sale.

        We will not receive any part of the proceeds from the resale by the
selling security holders of any common stock under this prospectus. We will bear
all expenses other than selling discounts and commissions and fees and

                                      -15-


expenses of the selling security holders in connection with the registration of
the shares being reoffered by the selling security holders.

                                LEGAL PROCEEDINGS

        We are not a party to any pending legal proceeding, other than routine
litigation that is incidental to our business, and are not aware of any
proceeding contemplated by a governmental authority against us.

                DIRECTORS, EXECUTIVE OFFICERS AND CONTROL PERSONS

TEONG LIM


        Teong Lim, age 66, currently serves as interim President and Chief
Executive Officer, Vice President of Corporate Development and a director of
Electronic Sensor Technology. Dr. Lim has served as a director of Electronic
Sensor Technology since January 31, 2005 and has served as Vice President of
Corporate Development since February 1, 2005. Dr. Lim was the director of
corporate development of Electronic Sensor Technology, L.P. from March 1995
through August 2000 and was the Manager of Corporate Development of Electronic
Sensor Technology, L.P. from August 2000 through February 2005. Dr. Lim has been
the President of Amerasia Technology, Inc., a subsidiary of Electronic Sensor
Technology, since 1984. Since 1997, Dr. Lim has been a director of Crystal Clear
Technology, Sdn. Bhd., a privately-owned Malaysian company that manufactures and
markets a high-contrast liquid crystal display (LCD) product line. Dr. Lim
received a Ph.D. in Electrical Engineering from McGill University in 1968 and an
M.B.A. from Pepperdine University in 1982. Dr. Lim does not serve as a director
of any other publicly reporting company.



FRANCIS CHANG

        Francis Chang, age 71, currently serves as Secretary and Vice President
of Finance and Administration and a director of Electronic Sensor Technology.
Mr. Chang has served as a director of Electronic Sensor Technology since January
31, 2005 and has served as Secretary and Vice President of Finance and
Administration since February 1, 2005. Mr. Chang was the Chief Financial Officer
of Electronic Sensor Technology, L.P. from March 1995 through February 2005. Mr.
Chang received a B.A. in Economics from National Taiwan University in Taiwan in
1956 and an M.B.A. from Pepperdine University in 1978. Mr. Chang does not serve
as a director of any other publicly reporting company.


JAMES FREY


        James Frey, age 67, currently serves as Chairman of the Board of
Directors of Electronic Sensor Technology. Mr. Frey has served as Chairman since
February 21, 2005. Mr. Frey serves on Electronic Sensor Technology's audit
committee and compensation committee. From June 1999 to March 2003, Mr. Frey
served as Chief Executive Officer of TASC Inc., a subsidiary of Litton/Northrup
Grumman. He also served as the Vice President of Information Technology at
Litton from March 2001 to March 2002. Mr. Frey is currently a director of SSG
Precision Optronics, a privately-held optical component manufacturing company.
Mr. Frey received a B.S. in Electrical Engineering from Duke University in 1960.
Mr. Frey does not serve as a director of any other publicly reporting company.


MIKE KRISHNAN


        Mike Krishnan, age 65, currently serves as a director of Electronic
Sensor Technology. Mr. Krishnan has served as a director of Electronic Sensor
Technology since February 21, 2005. Mr. Krishnan serves on our audit committee
and compensation committee. Mr. Krishnan has been President of L&G Resources
(1994) Inc. since August 2003. He has served as Managing Director of Land &
General Berhad since September 2001. Land & General Berhad is an investment
holding company with subsidiaries engaging in property development, property
management and education services in Malaysia and Australia. Mr. Krishnan also
served as the executive director of Antah Holdings Berhad from April 1990 to
October 2000. Mr. Krishnan received an A.M.P from Harvard Business School in
1987. Mr. Krishnan does not serve as a director of any other publicly reporting
company in the


                                      -16-



United States. Mr. Krishnan is a director of Land & General Berhad, which is
listed on the Kuala Lumpur Stock Exchange.


EDWARD STAPLES


        Edward Staples, age 62, currently serves as Chief Scientific Officer and
a director of Electronic Sensor Technology. Dr. Staples has served as a director
of Electronic Sensor Technology since January 31, 2005 and has served as Chief
Scientific Officer of Electronic Sensor Technology since May 26, 2005. From
February 1, 2005 through May 26, 2005, Dr. Staples served as President and Chief
Executive Officer of Electronic Sensor Technology. Dr. Staples was a co-founder
of Electronic Sensor Technology, L.P. and was its managing director from
February 1995 through February 2005. Dr. Staples received a B.S. in Electrical
Engineering from Loyola University in 1966, an M.S. in Electrical Engineering in
1969 and a Ph.D. in Solid State Electronics in 1971 from Southern Methodist
University. Dr. Staples does not serve as a director of any other publicly
reporting company.


JAMES WILBURN


        James Wilburn, age 73, currently serves as a director of Electronic
Sensor Technology. Dr. Wilburn has served as a director of Electronic Sensor
Technology since September 8, 2005. Dr. Wilburn serves on our audit committee
and compensation committee. Dr. Wilburn has served as dean of Pepperdine
University's School of Public Policy since September 1996. Dr. Wilburn has also
served Pepperdine as Vice President of University Affairs, and as provost and
Chief Operating Officer. He is also a member of the European Parliament
Industrial Council. Dr. Wilburn has served as a director of several companies in
the United States and Europe, including Signet Scientific, George Fisher
(Switzerland), The Olsen Company, Flowline, Brentwood Square Savings Bank and
First Fidelity Thrift and Loan. Dr. Wilburn received his Ph.D. in economic
history from the University of California at Los Angeles, a masters degree from
Midwestern State University and an MBA from Pepperdine's Presidential/Key
Executive program. He received his bachelors degree from Abilene Christian
University. Dr. Wilburn currently serves as a director of Virco Manufacturing,
which is a publicly reporting company.


GARY WATSON


        Gary Watson, age 56, currently serves as Vice President of Engineering
of Electronic Sensor Technology. Mr. Watson has served as Vice President of
Engineering since September 8, 2005. Mr. Watson is the co-inventor of the
zNose(R). Mr. Watson has over twenty years experience in gas chromatography. Mr.
Watson joined Amerasia Technology in 1988 and directed Amerasia Technology's
research in adapting gas chromatographic techniques with surface acoustic wave
(SAW) detectors. He received his B.S. degree from the University of Southern
California in 1972.


FAMILY RELATIONSHIPS AND INVOLVEMENT IN CERTAIN LEGAL PROCEEDINGS


        Each of our directors holds office until the next annual meeting of our
shareholders, or until his prior death, resignation or removal. There are no
family relationships among our directors or executive officers. Within the past
five years, there has not been any bankruptcy petition filed by or against any
business of which any of our officers, directors or control persons were a
general partner or executive officer either at the time of the bankruptcy or
within two years prior to that time. None of our officers, directors or control
persons has been convicted in a criminal proceeding in the past five years or is
subject to a pending criminal proceeding (excluding traffic violations and other
minor offenses). None of our officers, directors or control persons is subject
to any order, judgment, or decree, not subsequently reversed, suspended or
vacated, of any court of competent jurisdiction, permanently or temporarily
enjoining, barring, suspending or otherwise limiting his involvement in any type
of business, securities or banking activities. None of our officers, directors
or control persons has been found by a court of competent jurisdiction (in a
civil action), the Securities and Exchange Commission or the Commodity Futures
Trading Commission to have violated a federal or state securities or commodities
law, where the judgment has not been reversed, suspended, or vacated.


                                      -17-


AUDIT COMMITTEE FINANCIAL EXPERT


        While we believe that members of our Board of Directors each have some
of the attributes of an audit committee financial expert, no single individual
possesses all of the attributes; therefore, no one on our Board of Directors can
be deemed to be an audit committee financial expert. In forming our Board of
Directors, we sought out individuals who would be able to guide our operations
based on their business experience, both past and present, or their education.
Our business model is not complex and our accounting issues are straightforward.
Responsibility for our operations is centralized within our executive
management, which is comprised of four persons. We recognize that having a
person who possesses all of the attributes of an audit committee financial
expert would be a valuable addition to our Board of Directors, however, we are
not, at this time, able to compensate such a person therefore, we may find it
difficult to attract such a candidate.


         SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT


        The following table sets forth information, as of January 31, 2006,
concerning our issued and outstanding stock beneficially owned (i) by each
director and each named executive officer of Electronic Sensor Technology, (ii)
by all directors and executive officers of Electronic Sensor Technology as a
group and (iii) by each stockholder known by Electronic Sensor Technology to be
the beneficial owner of more than 5% of the outstanding common stock.





                                                          AMOUNT AND NATURE OF
                           NAME AND ADDRESS (1)           BENEFICIAL OWNERSHIP    PERCENTAGE OF
TITLE OF CLASS             OF BENEFICIAL OWNER             (SHARES OF STOCK)        CLASS (2)
--------------   --------------------------------------   --------------------    -------------
                                                                                
Common stock     Francis Chang*+++                                3,933,160 (3)            7.26%
Common stock     Teong Lim*+++                                    5,247,908 (4)            9.69%
Common stock     James Frey*                                                 0             0.00%
Common stock     Mike Krishnan*                                   9,948,801 (5)           18.36%
Common stock     Edward Staples*+++                               4,212,544 (6)            7.78%
Common stock     James Wilburn*                                              0             0.00%
Common stock     Gary Watson+                                       175,000 (7)            0.32%
                 Land & General Berhad++
                 c/o Electronic Sensor Technology, Inc.
                 1077 Business Center Circle
Common stock     Newbury Park, California 91320                   9,948,801 (8)           18.36%
                 L&G Resources (1994), Inc.++
                 c/o Electronic Sensor Technology, Inc.
                 1077 Business Center Circle
Common stock     Newbury Park, California 91320                      9,948,801            18.36%
                 3 Springs, LLC++
                 c/o Electronic Sensor Technology, Inc.
                 1077 Business Center Circle
Common stock     Newbury Park, California 91320                      3,595,913             6.64%


                                      -18-





                                                          AMOUNT AND NATURE OF
                           NAME AND ADDRESS (1)           BENEFICIAL OWNERSHIP    PERCENTAGE OF
TITLE OF CLASS             OF BENEFICIAL OWNER             (SHARES OF STOCK)        CLASS (2)
--------------   --------------------------------------   --------------------    -------------
                                                                                 
                 TC Lim, LLC++
                 c/o Electronic Sensor Technology, Inc.
                 1077 Business Center Circle
Common stock     Newbury Park, California 91320                      4,729,112             8.73%
                 Midsummer Investment Ltd.++
                 485 Madison Avenue, 23rd Floor
Common stock     New York, New York 10022                         17,701,228(9)           32.67%
                 Islandia L.P.++
                 485 Madison Avenue, 23rd Floor
Common stock     New York, New York 10022                        11,278,101(10)           20.82%
                 All directors and named executive
Common stock     officers as a group                             23,517,413(11)           43.41%



*  Director

+  Named executive officer

++ 5% or more beneficial owner

(1)   The address of each director and named executive officer is c/o
Electronic Sensor Technology, Inc., 1077 Business Center Circle, Newbury Park,
California 91320.


(2)   These percentages are calculated based upon the total amount of
outstanding shares of common stock held by any person or group plus any
securities that such person or group has the right to acquire within 60 days of
January 31, 2006 pursuant to options warrants, conversion privileges or other
rights, divided by 54,173,743, which represents the total number of shares of
common stock issued and outstanding as of January 31, 2006.

(3)   Includes 80,000 shares of common stock underlying options exercisable
within 60 days of January 31, 2006 and 257,247 shares of common stock underlying
a warrant exercisable within 60 days of January 31, 2006 and 3,595,913 shares of
common stock held by 3 Springs, LLC and beneficially owned by Mr. Chang by
virtue of his position as sole member of 3 Springs.

(4)   Includes 80,000 shares of common stock underlying options exercisable
within 60 days of January 31, 2006 and 438,796 shares of common stock underlying
a warrant exercisable within 60 days of January 31, 2006 and 4,729,112 shares of
common stock held by TC Lim, LLC and beneficially owned by Dr. Lim by virtue of
his position as sole member of TC Lim.

(5)   Includes 9,948,801 shares of common stock held by L&G Resources (1994),
Inc., of which Mr. Krishnan is a beneficial owner by virtue of being President
of L&G Resources (1994), Inc. and Managing Director of Land & General Berhad,
the parent company of L&G Resources (1994), Inc.

(6)   Includes 100,000 shares of common stock underlying options exercisable
within 60 days of January 31, 2006 and 343,708 shares of common stock underlying
a warrant exercisable within 60 days of January 31, 2006.

(7)   Includes 175,000 shares of common stock underlying options exercisable
within 60 days of January 31, 2006.

(8)   Includes 9,981,000 shares of common stock held by its wholly-owned
subsidiary, L&G Resources (1994), Inc., of which Land & General Berhad is a
beneficial owner.


                                      -19-




(9)   Includes 9,903,169 shares of common stock underlying a debenture
convertible within 60 days of January 31, 2006 and 7,798,059 shares of common
stock underlying a warrant exercisable within 60 days of January 31, 2006.
Midsummer Capital, LLC, a New York limited liability company, serves as
investment advisor to Midsummer Investment Ltd., a Bermuda company. By reason of
such relationships, Midsummer Capital may be deemed to share dispositive power
over the shares of common stock beneficially owned by Midsummer Investment.
Midsummer Capital disclaims beneficial ownership of such shares of common stock.
Michel A. Amsalem and Scott D. Kaufman are members of Midsummer Capital. By
reason of such relationships, Mr. Amsalem and Mr. Kaufman may be deemed to share
dispositive power over the shares of common stock stated as beneficially owned
by Midsummer Investment. Mr. Amsalem and Mr. Kaufman disclaim beneficial
ownership of such shares of common stock.

(10)  Includes 5,501,761 shares of common stock underlying a debenture
convertible within 60 days of January 31, 2006 and 5,776,340 shares of common
stock underlying a warrant exercisable within 60 days of January 31, 2006. The
general partner of Islandia is John Lang, Inc., a New York Sub-S corporation
formed to manage investments. By virtue of this relationship John Lang, Inc. may
be deemed to have indirect beneficial ownership of the shares of common stock
beneficially owned by Islandia; however, John Lang, Inc. disclaims beneficial
ownership of the shares of common stock beneficially owned by Islandia.

(11)  Includes 435,000 shares of common stock underlying options exercisable
within 60 days of January 31, 2006 and 1,039,751 shares of common stock
underlying warrants exercisable within 60 days of January 31, 2006, as well as
9,948,801 shares of common stock held by L&G Resources (1994), Inc., 3,595,913
shares of common stock held by 3 Springs, LLC and 4,729,112 shares of common
stock held by TC Lim, LLC.


                            DESCRIPTION OF SECURITIES


        As of January 31, 2006, Electronic Sensor Technology has 54,173,743
shares of common stock issued and outstanding and no shares of preferred stock
issued and outstanding. Electronic Sensor Technology is authorized to issue
200,000,000 shares of common stock in the aggregate and 50,000,000 shares of
preferred stock in the aggregate. Each of our shareholders is entitled to one
vote for each share of common stock on all matters submitted to a shareholder
vote. Holders of the common stock do not have cumulative voting rights.
Therefore, holders of a majority of the shares of common stock voting for the
election of directors can elect all of the directors. A quorum is required for
any annual or special meeting of our shareholders in order to transact any
business at the meeting, other than the election of the chairman or the
adjournment of the meeting. Two persons present and being, or representing by
proxy, shareholders constitutes a quorum. A vote by the holders of a majority of
our outstanding shares of common stock is required to effectuate certain
fundamental corporate changes such as liquidation, merger or an amendment to our
articles of incorporation.


        Dividends on our common stock may be declared and paid at such times as
the Board of Directors may determine. Holders of common stock are entitled to
share in all dividends that the Board of Directors, in its discretion, declares
from legally available funds. However, we have never paid cash dividends on our
common stock and do not anticipate paying cash dividends on our common stock in
the foreseeable future.

        In the event of a liquidation, dissolution or winding up, each
outstanding share of common stock entitles its holder to participate pro rata in
all assets that remain after payment of liabilities and after providing for each
class of stock, if any, having preference over the common stock. Holders of our
common stock have no pre-emptive rights, no conversion rights and there are no
redemption provisions applicable to our common stock.

        Certain provisions of our articles of incorporation, bylaws and Nevada
law, as well as certain agreements we have with our executives, could be used by
our incumbent management to make it substantially more difficult for a third
party to acquire control of us. These provisions include the following:

     o  we may issue preferred stock with rights senior to those of our
        common stock; and

                                      -20-


     o  the Board may fill casual vacancies occurring in the Board and
        may appoint one or more additional directors between annual
        meetings of shareholders to hold office until the next annual
        meeting of shareholders.

        These provisions may discourage certain types of transactions involving
an actual or potential change in control. These provisions may also limit our
shareholders' ability to approve transactions that they may deem to be in their
best interests and discourage transactions in which our shareholders might
otherwise receive a premium for their shares over the then current market price.

                      INTEREST OF NAMED EXPERTS AND COUNSEL


        No expert preparing or certifying all or part of this registration
statement or a report or valuation for use in connection with the registration
statement or counsel named in this prospectus as having given an opinion on the
validity of the securities being registered or upon other legal matters
concerning the registration or offering of the securities was hired on a
contingent basis, will receive a direct or indirect interest in Electronic
Sensor Technology, or was a promoter, underwriter, voting trustee, director,
officer, or employee of Electronic Sensor Technology.


              DISCLOSURE OF COMMISSION POSITION ON INDEMNIFICATION
                         FOR SECURITIES ACT LIABILITIES


        Under our bylaws, directors are generally indemnified for all costs,
charges and expenses incurred in connections with a proceeding to which a
director is made a party by reasons of his being or having been a director and
officers, employees and agents may be, at the discretion of the Board of
Directors, indemnified for all costs, charges and expenses incurred that result
from acting as an officer of the corporation. Nevada Revised Statute 78.7502
provides that Electronic Sensor Technology may indemnify directors, officers,
employees and agents of Electronic Sensor Technology for expenses reasonably
incurred in connection with and to the extent that such director, officer,
employee or agent of Electronic Sensor Technology has been successful on the
merits or otherwise in defense of any action, suit or proceeding or any claim,
issue or matter wherein such person "acted in good faith and in a manner which
he reasonably believed to be in or not opposed to the best interests of the
corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful," subject to certain
limitations.

        Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to directors, officers and controlling persons of
Electronic Sensor Technology pursuant to the foregoing provisions, or otherwise,
Electronic Sensor Technology has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public policy
as expressed in the Securities Act and is, therefore, unenforceable.


                             DESCRIPTION OF BUSINESS


        We are engaged in the development, manufacture, and sale of a patented
product we call zNose(R), a device designed to detect and analyze chemical odors
and vapors, or, in another words, an electronic "nose". We believe the zNose(R)
is superior to other electronic "noses" because of its speed, specificity and
sensitivity. The zNose(R) identifies the chemical makeup of any fragrance, vapor
or odor. The zNose(R) does this by creating a visual image of the fragrance,
vapor or odor that it detects, so that the user of the zNose(R) may easily
identify the fragrance, vapor or odor.

        We believe that our products will have broad applications in the
homeland security, environmental monitoring and detection and laboratory
instrument markets. We are involved in ongoing product research and development
efforts in that regard. We have also concentrated our efforts on further product
development, testing and proving, and assembling our sales and support
organization.

        Our executive offices are located at 1077 Business Center Circle,
Newbury Park, California 91320 and our telephone number is (805) 480-1994.

                                      -21-


HISTORY AND BACKGROUND


        We were incorporated under the laws of the state of Nevada as Bluestone
Ventures Inc. on July 12, 2000. From the date of our incorporation until
February 1, 2005, we were in the business of acquiring and exploring potential
mineral properties in Ontario, Canada. We changed our name to Electronic Sensor
Technology, Inc. on January 26, 2005 in connection with the acquisition of two
corporations that had together owned Electronic Sensor Technology, L.P. Since
the acquisition of Electronic Sensor Technology, L.P., our business has been the
development, manufacture and sale of instruments that detect and analyze vapors
and odors. We have abandoned our mining exploration business.

ELECTRONIC SENSOR TECHNOLOGY, L.P. ACQUISITION

        On February 1, 2005, pursuant to the terms of an Agreement and Plan of
Merger by and among Electronic Sensor Technology, Amerasia Technology, holder of
approximately 55% of the partnership interests of Electronic Sensor Technology,
L.P., L&G Sensor Technology, holder of approximately 45% of the partnership
interests of Electronic Sensor Technology, L.P., Amerasia Acquisition, a
wholly-owned subsidiary of Electronic Sensor Technology, and L&G Acquisition, a
wholly-owned subsidiary of Electronic Sensor Technology, Electronic Sensor
Technology acquired 100% of the outstanding equity partnership interest of
Electronic Sensor Technology, L.P. Under the Agreement and Plan of Merger:

        (i)    Amerasia Technology merged with and into Amerasia Acquisition
               such that it became a wholly-owned subsidiary of Electronic
               Sensor Technology;

        (ii)   L&G Sensor Technology merged with and into L&G Acquisition such
               that L&G Sensor Technology became a wholly-owned subsidiary of
               Electronic Sensor Technology;

        (iii)  as a result of the mergers of (i) and (ii), Electronic Sensor
               Technology indirectly acquired the partnership interests of
               Electronic Sensor Technology, L.P.; and

        (iv)   Electronic Sensor Technology issued 20,000,000 shares of its
               common stock to the shareholders of Amerasia Technology and L&G
               Sensor Technology.

        In November 2004, Electronic Sensor Technology, L.P. sold $200,000 in
limited partnership interests to certain bridge investors. Concurrent with the
mergers, these limited partnership interests were directly exchanged into
200,000 shares of common stock of Electronic Sensor Technology and warrants to
purchase 200,000 shares of common stock of Electronic Sensor Technology at $1.00
per share to certain investors.

        In connection with the mergers, Electronic Sensor Technology entered
into Subscription Agreements with certain investors on January 31, 2005. Under
these Subscription Agreements, Electronic Sensor Technology issued and sold in a
private placement 3,985,000 shares of its common stock and warrants to purchase
3,985,000 shares of common stock at $1.00 per share to certain investors for
gross proceeds of $3,985,000. Electronic Sensor Technology received the gross
proceeds of the sale of these shares on February 1, 2005. Electronic Sensor
Technology received net proceeds of approximately $3,821,000 less fees,
including counsel fees for the investors and Electronic Sensor Technology, L.P.
of approximately $164,000.

        Immediately following the mergers and the private placement, there were
53,968,471 shares of Electronic Sensor Technology common stock outstanding, of
which (i) shareholders of Bluestone prior to the mergers and the private
placement held 26,988,279 shares (approximately 50.0% of our common stock), (ii)
the shareholders of Amerasia Technology and L&G Sensor Technology prior to the
mergers and the private placement held 22,783,471 shares (approximately 42.2% of
our common stock) and (iii) investors in the private placement occurring on
February 1, 2005 as a group held 4,185,000 shares (approximately 7.8% of our
common stock). The distribution of shares to shareholders of Amerasia Technology
and L&G Sensor Technology was based on a $20 million valuation of the total
outstanding interests of Electronic Sensor Technology, L.P. The total
outstanding interests of Electronic Sensor Technology, L.P. were exchanged for
20,000,000 shares of Electronic Sensor Technology, Inc., at conversion rate of
$1.00 per share. In addition, 2,783,279 shares of Electronic Sensor Technology,
Inc. were


                                      -22-



distributed to pre-merger shareholders of Amerasia Technology and L&G Sensor
Technology in exchange for the cancellation of debt owed to such shareholders,
at a conversion rate of $1.00 per share. The conversion rate of $1.00 per share
was established immediately preceding the merger through the private placement
of 3,985,000 shares of common stock at $1.00 per share.


        In conjunction with the mergers, all of the officers and directors of
Bluestone resigned and Dr. Edward Staples was appointed President of Bluestone.
Dr. Staples, along with Mr. Francis Chang and Dr. Teong Lim were named directors
of Bluestone and the prior operations of Bluestone were terminated.


        Following the mergers we assumed as our principal operations, the
operations of Electronic Sensor Technology, L.P. and we appointed additional
officers. In May 2005, we expanded our Board of Directors from 5 to 7 directors
and appointed additional directors to fill the new directorships.


OVERVIEW OF PAST OPERATIONS OF ELECTRONIC SENSOR TECHNOLOGY, L.P.


        Following the mergers, our operations are a continuation of operations
originally conducted by Electronic Sensor Technology, L.P. Electronic Sensor
Technology, L.P. was formed in 1995 to develop and manufacture, the zNose(R), an
advanced technology in chemical vapor detection and analysis. The zNose(R) has
been developed with over $10 million in funding, primarily from equity funding
from existing equity holders. In 1999, Electronic Sensor Technology, L.P.
completed beta testing of its products and commenced commercial sales to the
analytical instrumentation/quality control market as well as the homeland
security market.

        In order to finance its operations, Electronic Sensor Technology, L.P.
obtained a 4% loan of $1.975 million from East West Bank in September 2003. This
loan was guaranteed by three officers of Electronic Sensor Technology, L.P. In
connection with the mergers, we assumed the then outstanding balance of $1.8
million on the East West Bank loan from Electronic Sensor Technology, L.P., and
the guarantees were released. In addition, we have agreed to pledge a $900,000
certificate of deposit as collateral for repayment under the loan.


INDUSTRY OVERVIEW

        Although there are a vast number of applications for the zNose(R)
product, we believe that the most significant demands for our product will be in
three general market categories - homeland security, analytical
instrumentation/quality control and environmental monitoring and detection.

        Homeland Security. According to published sources, the overall homeland
security market was projected to be $98-114 billion in 2004. We believe that
detection and analysis of chemical compounds will aid greatly in various
homeland security efforts including:


        o  Building Security. There is a need for a continuous and
           real-time chemical detection systems to monitor the air in
           buildings and in confined spaces. Detecting hazardous gases and
           poisonous chemical agents such as sarin, VX explosives, and
           contrabands for security and environmental safety purposes are
           the main concerns. We believe that the addressable commercial
           building security market segment may be as high as $1.2 billion
           based on the top 4% of the high-end commercial buildings that
           would seek protection from a chemical detection system.


        o  Marine Smart Containers. Over seven million sea cargo containers
           arrive in the U.S. every year and only 4% of them are being
           inspected by the U.S. Customs Department. Cargo container
           security is a top priority with the U.S. government. We seek to
           incorporate the zNose(R)product into the smart container
           program.

        o  Airports. Our zNose(R) products may be used to complement
           existing X-Ray and bomb detection technologies.

        o  Drug Interdiction. The zNose(R)has been used to detect
           contrabands, including illicit controlled substances along U.S.
           borders.

                                      -23-



        Analytical Instrumentation/Quality Control. The zNose(R) has been
serving the chemical vapor analysis needs in various manufacturing industries.
We estimate that the market for products such as zNose(R) may reach as much as
$50 million during the next few years. The zNose(R) has been used for a host of
applications relating to analysis and quality control such as:


           o  screening incoming raw materials;

           o  checking ingredients in processed food and pharmaceutical
              products;

           o   inspecting packaging materials and finished goods; and

           o   detecting hazardous gas leaks in chemical plants.

        Environmental Monitoring and Detection. The zNose(R) has been serving
rapid on-location needs in detection and monitoring of toxic chemicals in the
water for environmental protection purposes. In a recent toxic chemical spill
caused by a chemical plant explosion in northeastern China which contaminated
major water sources, the zNose(R) was deployed by local authorities to detect
and monitor toxic flows in a river and to determine the safety of the water on a
near real-time basis.

CONVENTIONAL ELECTRONIC NOSE TECHNOLOGY


        Conventional electronic noses are unable to meet the needs of the market
because of their fundamental construction. They are not able to identify
fragrances, vapors and odors with an acceptable degree of specificity and
preciseness. In addition, conventional electronic noses require sophisticated
computer software in order for its chemical analyses to be recognized. This type
of electronic nose is therefore not acceptable for use in scientific
measurement.


THE ZNOSE(R) SOLUTION


        Speed, precision and versatility are the key characteristics of the
zNose(R) product. The zNose(R) has been developed to replace the conventional
electronic nose. The zNose(R) operates as quickly as a conventional electronic
nose while delivering the precision and accuracy of a much more expensive
instrument. The zNose(R) has advanced chemical analysis technology by performing
vapor analysis within 10 seconds. Early models of the zNose(R) have been tested
by the U.S. Environmental Protection Agency under Environmental Technology
Verification program and by the Office of National Drug Control Policy for drug
interdiction. Tests have also been performed at the Midwest Research Institute's
Surety Laboratory in Kansas City and at the U.S. Army Dugway Proving Ground in
Utah with respect to the effectiveness of the zNose(R) in detecting chemical
agents such as sarin gases. We believe that the zNose(R) is currently the only
electronic nose approved for purchase through the General Services
Administration pre-approved procurement program.

        Our VaporPrint(TM) imaging ability is another major advantage of the
zNose(R) product. VaporPrint(TM) allows the user of the zNose(R) to see a visual
image of the makeup of a particular fragrance, vapor or odor within 10 seconds.
In addition, VaporPrint(TM) can produce high-resolution visual images of odor
intensity. VaporPrint(TM) images are displayed on a laptop computer screen and
are recorded on the hard drive of the laptop computer.


OUR PRODUCTS

ZNOSE(R)


        The zNose(R) is essentially a vapor detector that uses a sensor based on
Surface Acoustic Wave technology. Basically, the zNose(R) "inhales" a particular
fragrance, vapor or odor. The fragrance, vapor or odor is carried up through a
column and the chemicals making up the fragrance, vapor or odor condense on the
crystal surface of the sensor in the zNose(R). This condensation on the sensor
causes a change in what is called the "fundamental acoustic frequency" of the
crystal surface. It is this change in fundamental acoustic frequency that allows
the zNose(R) to determine the chemical makeup of the fragrance, vapor or odor.
This change is measured by a microprocessor that


                                      -24-



calculates what is known as the "Surface Acoustic Wave" frequency, based upon
the change in the fundamental acoustic frequency. Different chemicals produce
different Surface Acoustic Wave frequencies and, so, once the microprocessor in
the zNose(R) has determined the Surface Acoustic Wave frequency of the
unidentified fragrance, vapor or odor that the zNose(R) has "inhaled", it
compares it to chemical odor profiles that are stored on the hard drive of a
laptop computer that is connected to the zNose(R), which allows the zNose(R)
user to identify the particular fragrance, vapor or odor.

        We currently manufacture and sell two zNose(R) models designated as
Model 4200 (Handheld Unit) and Model 7100 (Bench Top Unit). Model 4200 is
designed for portability and for applications requiring quick and accurate vapor
screening in the field. Model 7100 is designed for laboratory testing and is
ideal for testing water and product quality control samples. Both Model 4200 and
Model 7100 weigh approximately 27 pounds, not including a laptop computer that
must be used with each zNose(R). The Model 4200 has two housings (the case and
the detector head) and a laptop computer. The case of the Model 4200 is 10" x
12" x 6" and weighs 20 pounds and the detector head of the Model 4200 is 4 1/4"
x 12" x 7" and weighs 7 pounds. The Model 7100 is packaged in a single housing
and also requires a laptop computer. The dimensions of the Model 7100 packaging
are 14.3" x 14.3" x 7.5". Both the Model 4200 and Model 7100 are powered by a
standard AC electrical outlet, and both models adapt to standard outlets in
North America, Asia and Europe (i.e., the zNose(R) may be operated by a 110 volt
or 220 volt power source). In addition, both the Model 4200 and 7100 may be
powered by connecting the unit to a car battery with an appropriate adaptor.
Either model can be produced in one of two basic vapor sensing configurations:
volatile and semi-volatile. The volatile configuration can detect volatile
organic compounds, such as benzene. The semi-volatile configuration can detect
heavier vapors such as those found in explosives and drugs.


        We are also developing Models 7100B and 7100C. Model 7100B is designed
as a fixed installation unit for both indoor and outdoor ambient air monitoring
instrument. It can be used for building security as well as outdoor
environmental monitoring applications. It is designed to be operated remotely
from a central control station via a radio frequency (RF) control link. Model
7100C is designed to be used for shipping containers and truck monitoring for
both commercial and homeland security applications. It is designed to be used
with a remote sampling kit which enables multiple samples to be collected then
taken to the zNose(R) to be analyzed.

        We have designs to produce a hand-held zNose(R) that is smaller than the
Model 4200 for commercial market. This model is designed to meet the needs of
law enforcement, manufacturing process monitoring, and environmental monitoring.
We plan to develop a separate version of the mini-zNose(R) to be used as a
personal nerve agents detector for the military and security markets.

        All zNose(R) models analyze vapors in a two-step process. In the first
step, typically lasting 10 seconds, the instrument collects a small sample of
the vapor to be analyzed. The sample is then injected in to a gas chromatography
column where the individual chemicals present are separated and measured. The
chemical analysis requires only 10 seconds to produce the vapor's chemical
signature we call "VaporPrint". The system software can also produce full
chromatograms.

ACCESSORIES

        We offer several lines of accessory products such as calibration
devices, sample desorbers, MicroSense Software(C), and GPS receivers. An example
is our Model 3100 which provides a calibrated vapor source as well as a tool for
extracting vapors from solid and liquid samples.

TECHNICAL SUPPORT

        All zNose(R) instruments sold are equipped with a software package
called PCAnywhere. PCAnywhere allows a technical support person at EST to
operate an instrument anywhere in the world through the internet. This better
enables an EST technician to be available to address any customer problem.

SALES AND DISTRIBUTION

        We sell our zNose(R) product through distribution channels including
equipment distributors and sales representatives in over 20 foreign countries,
e-commerce and customer referrals. We entered into an agreement with
TechMondial, Ltd. to be our exclusive distributor for a seven-year period in the
countries of the European

                                      -25-


Community, Romania, Bulgaria, Turkey, Croatia and Switzerland on October 21,
2005. We entered into an agreement with eScreen Sensor Solutions to be our
exclusive distributor for a five-year period in Israel, the Caribbean, the State
of Florida, and Central and South America on October 16, 2003. As part of this
latter agreement, eScreen paid us an up-front fee of $250,000 in 2004.


        All sales representatives and distributors are required to attend a
three-day training course conducted at our headquarters in Newbury Park,
California. We advertise in selected industry trade journals and trade
conventions. In the future, we intend to build a dedicated marketing and sales
team. We have historically generated sales from both U.S. and international
customers, each of which have accounted for approximately 50% of our sales in
the past. However, in the fiscal year ending December 31, 2005, international
customers accounted for approximately two-thirds of our total sales. We expect a
similar split among U.S. and international sales to continue. All of our
customers pay us in U.S. dollars. Major domestic customers include
the U.S. Armed Forces, Lockheed Corporation and NASA. Major international
customers include Beijing R&D Technology Company Ltd. in China, TechMondial
Limited of England, Hitachi Corporation in Japan and Max Planck Institute
in Germany.


COMPETITION


        We are unaware of any direct competitor to the zNose(R) product on the
market today. In the homeland security markets, we face competition from
manufacturers of X-Ray machines, Ion-Mobility Spectrometers and chemical coated
sensors. X-Ray machines have been widely used for security purposes in detecting
metal objects but not for chemical compounds. Ion-Mobility Spectrometer
equipment is a vapor detector and is designed to detect certain compounds but is
blind to other compounds. Hence, it can only see a small dot in a space but
cannot see the total picture. It employs a different sample collection technique
by wiping the surfaces of the object placed for screening. Ion-Mobility
Spectrometer also uses materials in its construction which may be offensive to
users in certain countries.

        Chemical coated sensors are the conventional electronic noses. They use
an array of chemical sensors each reacting to certain specific compounds. As
mentioned earlier, electronic noses cannot be calibrated with chemical standards
and therefore cannot be used for scientific measurement.

        We have another set of competitors manufacturing portable vapor and odor
analysis products for the instrumentation market from major corporations such as
Agilent Technologies, Inc. (A:NYSE), Perkin-Elmer, Inc. (PKI:NYSE) and Varian,
Inc. (VARI:NASDAQ). We believe that our zNose(R) product is competitive with
these companies' products based on speed and cost.


        Many of our current and potential competitors have larger customer
bases, including the previously listed competitors, greater brand recognition
and significantly greater financial, marketing and other resources than we do
and may enter into strategic or commercial relationships with larger, more
established companies. Some of our competitors may be able to secure alliances
with customers and affiliates on more favorable terms, devote greater resources
to marketing, advertising and promotional campaigns and devote substantially
more resources to research and development than we do. In addition, new
technologies and the expansion of existing technologies may increase the
competitive pressures on us.

        We cannot assure you that we will be able to compete successfully
against current or future competitors, and competitive pressures faced by us
could harm our business, operating results and financial condition. We do not
currently represent a significant competitive presence in the homeland security
or analytic instrumentation markets.

MANUFACTURING AND RAW MATERIALS


        We design, prototype and manufacture our products at our headquarters.
Our manufacturing facilities adhere to ISO9000 manufacturing methods (quality
standards developed by the International Organization for Standardization, which
have been adopted by many countries around the world). We contract out the
manufacturing and assembling of certain components to subcontractors. Our
current annual manufacturing capacity is approximately 1,000 zNose(R) units. The
principal components to our products are computer chips, circuit boards,
transformers and sensory devices. The prices for these components are subject to
market forces largely beyond our


                                      -26-


control, including energy costs, market demand, and freight costs. The prices
for these components have varied significantly in the past and may vary
significantly in the future. Our principal suppliers of components and raw
materials include: Sigma Co. of Bellefonte, Pennsylvania, Ventura Fluid System
Technologies of Camarillo, California and Valco Instruments Co., Inc. of
Houston, Texas.

CUSTOMERS


        In 2005, we had approximately 35 customers. Our largest customer in
2005, Beijing R&D Technology Company Ltd., purchased 15 of the total 56
zNose(R)units sold by us in 2005, constituting approximately 27% of the
zNose(R)units sold in 2005. In 2005, we selected Beijing R&D Technology Co.,
Ltd. to be our exclusive distributor in China and TechMondial, Ltd. to be our
exclusive distributor in the countries of the European Community, Romania,
Bulgaria, Turkey, Croatia and Switzerland for a seven-year term. Our largest
customers are (1) Beijing R&D Technology Company Ltd. of China (2) Tech Mondial
Limited of England and (3) Agency for Defense Development of the Republic of
South Korea.


PATENTS, TRADEMARKS AND OTHER PROPRIETARY RIGHTS

        We regard our patents, trademarks, trade names and similar intellectual
property as critical to our success. We rely on patent and trademark laws, trade
secret protection and confidentiality agreements with employees, distributors,
customers, partners and others to protect our proprietary rights.

        We own four United States patents covering our zNose(R) product,
including:

           o  No. 5,289,715, "Vapor Detection Apparatus and Method
              Using an Acoustic Interferometer" issued March 1, 1994;

           o  No. 5,970,803, "Method and Apparatus for Identifying and
              Analyzing Vapor Elements", issued October 26, 1999;

           o  No. 6,212,938, "Method of Detecting Smell of a Vapor and
              Producing a Unique Visual Representation thereof,"
              issued April 10, 2001;

           o  No. 6,354,160, "Method and Apparatus for Identifying and
              Analyzing Vapor Elements," issued December 3, 2002.

        We may not be able to obtain patent protection for any derivative uses
of zNose(R), or for any other products we may later acquire or develop. We also
cannot assure you that we will be able to obtain other foreign patents to
protect our products.


        We have copyrighted our MicroSense Windows software and Xilinx gate
array firmware, which controls the operation of the zNose(R) and produces visual
images. These images, trademarked as VaporPrints(TM), make it possible to
display vapor analysis data from any vapor analysis system, as unique visual
images and facilitate pattern recognition of complex odors and fragrances.

        At January 31, 2006, we held registered trademarks for zNose(R) and
VaporPrints(TM). We intend to evaluate the possible application for new patents
and trademarks as needed to cover current and future applications of our
technology and product developments. We intend to undertake all steps necessary
to preserve and protect our patents, trademarks and intellectual property
generally.


        We are not aware that our products, trademarks or other proprietary
rights infringe the rights of third parties, nor are we aware of any
infringements of our proprietary rights. We continually evaluate potential
infringements of our proprietary rights and intend to take such legal and other
actions as may be necessary to protect those rights. However, there can be no
assurance that third parties will not assert infringement claims against us in
the future with respect to current or future products or that any such assertion
may not require us to enter into royalty arrangements or result in costly
litigation.

                                      -27-


GOVERNMENT REGULATION

        Government agencies, in particular, the Department of Defense, are
principal customers for our products. We are required to comply with the Federal
Acquisition Regulations, a comprehensive set of regulations governing how
vendors do business with the U.S. federal government, to the extent we contract
with departments or agencies of the U.S. government, as well as similar
regulations to the extent we contract with state or local governments. Sales to
or grants from foreign governments or organizations will have their own
regulatory framework, which may or may not be similar to present U.S. standards
or requirements.

RESEARCH AND DEVELOPMENT


        Our research and development program consists of developing technologies
related to enhancing our electronic nose product and making it more portable.
Fees related to research and development, include consulting fees, technical
fees, and research, development and testing of our zNose(R) product. We spent
approximately $600,000 in each of 2005 and 2004 on research and development
activities, none of which was borne directly by customers.


EMPLOYEES


        As of December 31, 2005 we had a total of 23 staff persons, including 21
full time staff and 2 consultants. In addition to management, we employ sales
people, administrative staff, and development and technical personnel. From time
to time, we may employ independent consultants or contractors to support our
research and development, marketing, sales and support, and administrative
organizations. No collective bargaining units represent our employees and
Electronic Sensor Technology is not party to any labor contracts.


REPORTS TO SECURITY HOLDERS


        Electronic Sensor Technology is not required to and does not currently
deliver an annual report to security holders. Electronic Sensor Technology is a
reporting company and files with the Securities and Exchange Commission annual
reports on Form 10-KSB, quarterly reports on Form 10-QSB and current reports on
Form 8-K. The public may read and copy any materials that Electronic Sensor
Technology files with the SEC at the SEC's Public Reference Room at 450 Fifth
Street, N.W., Washington, D.C. 20549. The public may obtain information on the
operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330. The
SEC maintains an Internet site that contains reports, proxy and information
statements, and other information regarding issuers that file electronically
with the SEC at: http://www.sec.gov. More information regarding Electronic
Sensor Technology is available at our website: http://www.znose.com.


CAPITALIZATION


        The following table sets forth our capitalization as of September 30,
2005. The tables should be read in conjunction with our consolidated financial
statements and related notes included elsewhere in this prospectus. All
information below excludes the recent financing with Midsummer Investment, Ltd.
and Islandia, L.P. and any securities issued subsequent to September 30, 2005.


                               September 30, 2005
                                   (unaudited)

Long-term debt....................................................           $ 0
Stockholders' equity:
  Common stock; $0.001 par value; 200,000,000
   Shares authorized; 53,968,643 shares issued
   and outstanding.................................................    $ 53,969
  Additional paid-in capital.......................................$ 12,233,816
  Accumulated deficit.............................................($ 11,975,682)
Total Stockholders' equity.........................................   $ 312,103
Total capitalization...............................................   $ 312,103


                                      -28-


                MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                       CONDITION AND RESULTS OF OPERATIONS


        You should read the following discussion and analysis of our financial
condition and results of operations together with the financial statements and
the related notes appearing at the end of this prospectus. The following
discussion and other parts of this prospectus contain forward-looking statements
that involve risks and uncertainties. Forward-looking statements can be
identified by words such as "anticipates," "expects," "believes," "plans," and
similar terms. Our actual results could differ materially from any future
performance suggested in this prospectus as a result of factors, including those
discussed in "Risk Factors" beginning on page 2 and elsewhere in this
prospectus. All forward-looking statements are based on information currently
available to us and we assume no obligation to update such forward-looking
statements, except as required by law. Service marks, trademarks and trade names
referred to in this prospectus are the property of their respective owners.

        As a result of the mergers whereby Electronic Sensor Technology, L.P.
became a wholly-owned indirect subsidiary of Electronic Sensor Technology and
the subsequent termination of Bluestone's prior operations, our business plan
has been altered to focus on the product operations previously conducted by
Electronic Sensor Technology, L.P. Following the mergers, our revenues were
expected to be, and have been, derived principally from the sale of the zNose(R)
products.


CRITICAL ACCOUNTING POLICIES


        Electronic Sensor Technology records revenue from direct sales of
products to end-users when the products are shipped, collection of the purchase
price is probable and Electronic Sensor Technology has no significant further
obligations to the customer. Costs of remaining insignificant Company
obligations, if any, are accrued as costs of revenue at the time of revenue
recognition. Cash payments received in advance of product or service revenue are
recorded as deferred revenue.


        The preparation of the financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosures of contingent assets and liabilities at the date of the financial
statements and the recorded amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.


        Electronic Sensor Technology reviews long-lived assets, such as property
and equipment, to be held and used or disposed of, for impairment whenever
events or changes in circumstances indicate that the carrying amount of an asset
may not be recoverable. If the sum of the expected cash flows, undiscounted and
without interest, is less than the carrying amount of the asset, an impairment
loss is recognized as the amount by which the carrying amount of the asset
exceeds its fair value. At September 30, 2005 no assets were impaired.


                                      -29-


RESULTS OF OPERATIONS


NINE MONTHS ENDED SEPTEMBER 30, 2005 COMPARED TO NINE MONTHS ENDED SEPTEMBER 30,
2004


        The following table sets forth, as a percentage of revenues, certain
items included in our Income Statements (see Financial Statements and Notes) for
the periods indicated:

                                          NINE MONTHS ENDED
                                            SEPTEMBER 30
                                         -------------------
        STATEMENTS OF OPERATIONS DATA:     2005       2004
        ------------------------------   --------   --------
        Revenues                              100%       100%
        Cost of sales                          79%        75%
        Gross profit                           14%        25%
        Operating expenses                    141%        45%
        Other Income and Expense                3%        15%
        Net loss                             (123%)      (36%)

        Revenues for the nine months ended September 30, 2005 were $1,380,000
compared to $959,000 in 2004, of which $250,000 related to one-time licensing
income. As such, only $709,000 of the $959,000 in revenues for the 2004 period
were attributable to our product sales. In other words, this increase of 44% was
actually attributable to an 85% increase in the number of zNose(R) units shipped
from 20 units in 2004 to 37 units in 2005 for the nine month period (the average
unit selling price was $37,297 during the nine months ended September 30, 2005
and $35,450 during the same period in 2004).

        Gross profit was $186,995 for the nine months ending September 30, 2005,
compared to $235,220 for the nine months period ending September 30, 2004. This
decrease of approximately 21% was largely attributable to the $250,000 one-time
licensing fees received in the nine months ending September 30, 2004. The direct
costs attributable to generating these licensing fees is estimated at $62,500,
or 25% of the revenue generated. As such, if the revenues and costs relating to
the licensing fees are disregarded, the gross profit margin per unit actually
increased by approximately 112%. This significant increase in gross profit
margin for the nine months ended September 30, 2005 is due to the increase in
the number of units shipped, which consequently reduced idle labor hours. We
believe that our per unit manufacturing costs will continue to decline as we
increase the number of units sold per quarter, due to these economies of scale.


        Compensation expenses in the first nine months of 2005 were $332,000, as
compared to $60,000 in 2004. As a percentage of sales, total compensation
expenses increased from 6% of sales, to 24% of sales. The increase of $272,000
was due to the increase of personnel costs, due to the hiring of new employees.

        Selling expenses for the first nine months of 2005 were $359,000, as
compared to $123,000 in 2004. As a percentage of sales, total selling expenses
increased from 13% of sales to 26% of sales. This increase of $236,000 was due
to an increase in Sales and Marketing personnel costs and expanded sales
activities.

        General and administrative expenses for the first nine months of 2005
were $1,134,000, as compared to $253,000 in 2004. As a percentage of sales,
general and administration expenses increased from 26% of sales to 82% of sales.
This increase of $881,000 was primarily due to costs incurred in connection with
the reverse merger in February 2005, and the added costs involved in being a
publicly traded company.

        Interest expense for the first nine months of 2005 was $54,658, as
compared to $ 61,896 in 2004. This slight decrease is due to offsetting interest
income of $12,722 from a certificate of deposit in the amount of $900,000.


        Net Loss was $1,701,000 for the period ending September 30, 2005 as
compared to a loss of $343,000 for the nine-month period ending September 30,
2004. The increase was primarily due to higher operating expenses in the
nine-month period of 2005 including a one time charge of approximately $635,000
in connection with the reverse merger (consisting of approximately $310,000 in
legal fees, $143,000 in investment banking and consultant

                                      -30-



fees and $182,000 in public relations firm fees), increased sales activities,
increased personnel costs and an expanded new product development effort.

FISCAL YEAR ENDED DECEMBER 31, 2004 COMPARED TO FISCAL YEAR ENDED
DECEMBER 31, 2003


        The following table sets forth, as a percentage of revenues, certain
items included in our Income Statements (see Financial Statements and Notes) for
the periods indicated:

                                  FISCAL YEAR ENDED
                                     DECEMBER 31,
                                 -------------------
STATEMENTS OF OPERATIONS DATA:     2004       2003
------------------------------   --------   --------
Revenues                              100%       100%
Cost of sales                          82%        92%
Gross profit                           18%         8%
Operating expenses                     41%        33%
Other Income and Expense                9%         6%
Net loss                              (32%)      (32%)

        Revenues for the fiscal year ended December 31, 2004 were $1,268,416
compared to $1,242,296 in 2003. $250,000 of the increase between our 2003
revenues and our 2004 revenues was attributable to one-time licensing income. As
such the slight increase of only 2% was partially attributable to this one-time
licensing income and revenues attributable to product sales declined
approximately 18%. This decline in product sales was due to the lack of working
capital available for marketing and promotional efforts needed in order to
further penetrate the relevant market.


        Gross profit was $229,136 for the fiscal year ended December 31, 2004,
compared to $98,946 in 2003. This increase of almost 132% resulted from
increased sales and a decrease in direct manufacturing costs.

        Compensation expenses for the fiscal year ended December 31, 2004 were
$81,734, compared to $80,601 in 2003. Personnel costs were maintained at
substantially the same level in 2004 as in the previous year.


        Selling expenses for the fiscal year ended December 31, 2004 were
$161,546, compared to $114,124 in 2003. This increase of approximately 42% was
primarily due to an increase in sales commissions. Although our product sales
declined somewhat during the fiscal year ended December 31, 2004 compared to
2003, there was an increase in sales commissions because a large portion of 2003
sales were attributable to domestic sales on house accounts, which do not
require a payment of commission to any of our distributors or sales
representatives. Our sales in 2004 were comprised of a larger portion of
international commissionable sales through our distributors and sales
representatives.

        General and administrative expenses for the fiscal year ended December
31, 2004 were $282,305, compared to $219,646 in 2003. This increase of $62,659,
or approximately 29%, was due to increased professional and legal expenses,
personnel-related costs and general office expenses. Of this increase of
$62,659, approximately $31,320 was due to a 78% increase in professional and
legal fees from $40,030 in 2003 to $71,350 in 2004, mainly due to an increase in
fees paid to outside auditors and legal fees relating to fundraising activities.
The remaining $31,399 was primarily due to the following costs relating to the
general expansion of our operations: (i) personnel-related costs, such as
employee benefits and 401k employer contributions and (ii) general office
expenses, such as (a) maintenance and repair (which increased by 28%) and (b)
office supplies and computer support (which increased 103% from $9,247
in 2003 to $18,808 in 2004).


        Interest expense for the fiscal year ended December 31, 2004 was
$164,133, compared to $80,418 in 2003. The increase of approximately 104% was
due to an increase in the level of funds borrowed under our revolving line of
credit from East West Bank.

                                      -31-



        Other income for the fiscal year ended December 31, 2004 was $57,076,
compared to $264 in 2003. The increase of approximately $57,000 was due to the
write-off of a liability for a company that discontinued its operations.


        Net Loss was $411,216 for the fiscal year ended December 31, 2004,
compared to a net loss of $394,397 in 2003. The increase in net loss of
approximately 4% primarily reflected increased operating expenses.

LIQUIDITY AND CAPITAL RESOURCES


        As a result of the mergers, as of February 1, 2005, we assumed certain
liabilities and obligations of Electronic Sensor Technology, L.P. Total
liabilities assumed pursuant to the mergers were approximately $2.2 million,
including approximately (1) $1.8 million owed under a revolving line of credit
with East West Bank, (2) $212,000 of accounts payable and accrued expenses and
(3) $35,000 of other current liabilities. The outstanding loan for $1.8 million
with East West Bank accrues interest at the prime rate as reported in the Wall
Street Journal plus one-half point (0.5%). It had an original maturity date of
December 31, 2005, which was extended to February 28, 2006 in order to provide
additional time for processing a pending renewal of the line of credit. The loan
is collateralized by all assets of Electronic Sensor Technology. As part of such
collateral, we have also pledged a certificate of deposit of $900,000 to East
West Bank.


        In February 2005, we raised $3.985 million from the sale of 3.985
million shares of common stock and warrants.


        In the first nine months of 2005, net cash used by Electronic Sensor
Technology for operating activities was $2,248,000. In the first nine months of
2004, the cash used by Company's operations was $123,000.


        Investing activities used cash of $79,000 in the first nine months of
2005 and used $4,000 during the same period in 2004. In both 2005 and 2004 the
cash was used to purchase of equipment.

        Financing activities provided net cash of $3.4 million (a private
placement of $3.895 million, less fees and expenses) and $7,000 during the first
nine months ending September 30, 2005 and 2004, respectively. The increase was
primarily due to the issuance of common stock of $3.895 million.


        On September 30, 2005, Electronic Sensor Technology retained cash on
hand of $1.1 million, compared to $1,000 on September 30, 2004. On September 30,
2005, Electronic Sensor Technology had working capital of $180,844, as compared
to a working deficit of $5.7 million on September 30, 2004. Electronic Sensor
Technology, at present, has a credit facility in place with East West Bank for
$1.8 million. The outstanding line of credit on the East West Bank facility as
of September 30, 2005 was $1,700,137 with an annual interest rate of 0.5% above
the bank prime rate, payable monthly.


CONVERTIBLE DEBENTURES AND WARRANT FINANCING


        On December 7, 2005, we issued to Midsummer and Islandia $7,000,000
aggregate principal amount of convertible debentures due December 7, 2009 with a
conversion price of $0.4544 per share and five-year warrants to purchase
13,574,399 shares of common stock at an exercise price of $0.4761 per share. Net
proceeds from the sale of the debentures (totaling $6,379,500) and any net
proceeds from the issuance of shares of common stock as a result of the exercise
of the warrants will be used for working capital.

        Although Electronic Sensor Technology possesses a bank operating line of
credit, there can be no assurance that these proceeds together with the net
proceeds of the debentures will be adequate for our capital needs. There can be
no assurance that any required or desired financing will be available through
any other bank borrowings, debt, or equity offerings, or otherwise, on
acceptable terms. If future financing requirements are satisfied through the
issuance of equity securities, investors may experience significant dilution in
the net book value per share of common stock and there is no guarantee that a
market will exist for the sale of our shares.


                                      -32-



        Our primary capital needs are to fund our growth strategy, which
includes creating a sales and marketing staff for the marketing, advertising and
selling of the zNose(R) family of chemical detection products, increasing
distribution channels both in U.S. and foreign countries, introducing new
products, improving existing product lines and development of a strong corporate
infrastructure. We anticipate that we will need to raise an additional $5 to 7
million in the near future in order to realize these objectives. We expect to do
this through increased equity investment in our common stock or the issuance of
additional convertible debt instruments.

        As of December 31, 2005, our cash balance and working capital were
$5,138,597 and $6,762,964, respectively. Our current monthly cash burn rate is
approximately $250,000 and we do not anticipate any extraordinary cash payments
that we will have to make in the near future until the first principal payment
of approximately $780,000 is due on the convertible debentures that we issued on
December 7, 2005, which such payment is to be made on January 1, 2008. Based on
our current monthly cash burn rate, we believe that we will not require any
financing until the second half of 2007, at the earliest. Accordingly, we
believe that we will be able to continue as a going concern for at least the
next twelve months.


SEASONALITY AND QUARTERLY RESULTS

        We do not foresee any seasonality to our revenues or our results of
operations.

INFLATION

        Although we currently use a limited number of sources for most of the
supplies and services that we use in the manufacturing of our vapor detection
and analysis technology, our raw materials and finished products are sourced
from cost-competitive industries. While prices for our raw materials may vary
significantly based on market trends, we do not foresee any material
inflationary trends for our product sources.

OFF BALANCE SHEET ARRANGEMENTS

        We do not have any off-balance sheet arrangements.

                             DESCRIPTION OF PROPERTY

        We lease approximately 13,500 square feet of office space at 1077
Business Center Circle, Newbury Park, California. Our current lease expires on
September 30, 2006. The lease payments are $15,826 per month. The facility
serves as the company's headquarters and R&D and manufacturing facility.

INVESTMENT POLICIES


        We do not invest, nor do we plan to invest in the foreseeable future in
real estate, interests in real estate, real estate mortgages, securities of or
interests in persons primarily engaged in real estate activities.


                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS


        Electronic Sensor Technology, L.P., prior to becoming an indirect
subsidiary of Electronic Sensor Technology, Inc., was a party to the following
transactions with the following then executive officers and directors of
Electronic Sensor Technology, L.P. during the past two years:

       o  On January 22, 2005, Electronic Sensor Technology, L.P.
          converted $399,643 in debt of Electronic Sensor Technology, L.P. held
          by Edward Staples, then Managing Director of Electronic Sensor
          Technology, L.P., into the right to receive, upon completion of the
          acquisition of Electronic Sensor Technology, L.P. by Bluestone
          Ventures Inc. (predecessor to Electronic Sensor Technology, Inc.),
          399,643 shares of common stock of Bluestone and warrants to purchase
          199,821.5 shares of common stock of Bluestone at $1.00 per share,
          exerciseable only if the trading price of such stock is at least $1.50
          per share. In addition, Electronic Sensor Technology, L.P. converted
          $952,577 in debt owed to Amerasia Technology into the right to receive
          shares of common stock of Bluestone and warrants to purchase shares of
          common stock of Bluestone. By virtue of his 30.21% ownership of
          Amerasia Technology, Dr. Staples obtained the right to receive, upon
          the acquisition of Electronic Sensor Technology, L.P. by Bluestone,
          287,773 shares of Bluestone common stock and warrants to purchase
          143,866.5 shares of Bluestone common stock at $1.00 per share,
          exercisable only if the trading price of such stock is at least $1.50
          per share.

                                      -33-


        o On January 22, 2005, on the same terms as those described
          above, Electronic Sensor Technology, L.P. converted $226,720 in
          debt of Electronic Sensor Technology, L.P. held by 3 Springs, LLC
          (of which Francis Chang, then Chief Financial Officer of
          Electronic Sensor Technology, L.P. is the sole member), into the
          right to receive, 226,720 shares of Bluestone common stock and
          warrants to purchase 113,360 shares of Bluestone common stock. In
          addition, 3 Springs, LLC obtained the right to receive 287,773
          shares of Bluestone common stock and warrants to purchase
          143,886.5 shares of Bluestone common stock by virtue of its
          30.21% ownership of Amerasia Technology.

        o On January 22, 2005, on the same terms as those
          described above, Electronic Sensor Technology, L.P.
          converted $517,899 in debt of Electronic Sensor Technology,
          L.P. held by TC Lim, LLC (of which Teong Lim, then Manager
          of Corporate Development of Electronic Sensor Technology,
          L.P. is the sole member), into the right to receive, 517,899
          shares of Bluestone common stock and warrants to purchase
          258,949.5 shares of Bluestone common stock. In addition, TC
          Lim, LLC obtained the right to receive 359,693 shares of
          Bluestone common stock and warrants to purchase 179,846.5
          shares of Bluestone common stock by virtue of its 37.76%
          ownership of Amerasia Technology.


            MARKET FOR COMMON EQUITY AND RELATED STOCKHOLDER MATTERS


        Our common stock has been quoted on the Over-the-Counter Bulletin Board
since February 1, 2005 under the symbol "ESNR:OB". Prior to February 1, 2005 our
common stock was quoted on the Over-the-Counter Bulletin Board under the symbol
"BLUV:OB". There is currently no broadly followed, established public trading
market for our common stock. The quarterly range of high and low
Over-the-Counter Bulletin Board quotation information for our common stock for
the last two fiscal years is set forth below. These quotations reflect
inter-dealer prices, without retail mark-up, mark-down or commission, and may
not represent actual transactions.


                       QUARTERLY COMMON STOCK PRICE RANGES


QUARTER ENDED                        2005
-------------                 ------------------
                               HIGH        LOW
                              -------    -------
December 31                   $   .62    $   .27
September 30                     1.19        .42
June 30                          2.50       1.07
February 1-March 31              2.51       1.90

QUARTER ENDED                        2004
-------------                 ------------------
                               HIGH        LOW
                              -------    -------
December 31                   $   .01    $   .01
September 30                      .01        .01
June 30                           .01        .01
March 31                          .01        .01

        37,110,913 of our shares of common stock are subject to outstanding
options or warrants to purchase, or securities convertible into common stock.

                                      -34-



        As of February 1, 2006, 26,968,741 shares of our common stock may be
sold pursuant to Rule 144 under the Securities Act. In addition to the shares of
common stock registered herein, we have agreed to register 21,475,584 shares of
common stock under the Securities Act for sale by security holders.

        There were approximately 63 record holders of our common stock as of
January 31, 2006. This number does not include an indeterminate number of
shareholders whose shares are held by brokers in street name.


        We have not paid dividends on our common stock since our inception. The
decision to pay dividends on common stock is within the discretion of the Board
of Directors. It is our current policy to retain any future earnings to finance
the operations and growth of our business. Accordingly, we do not anticipate
paying any dividends on common stock in the foreseeable future.

SECURITIES AUTHORIZED FOR ISSUANCE UNDER EQUITY COMPENSATION PLANS

        The following table illustrates, as of December 31, 2005, information
relating to all of our equity compensation plans:

                      EQUITY COMPENSATION PLAN INFORMATION



                                                                                      NUMBER OF SECURITIES
                                  NUMBER OF SECURITIES TO BE     WEIGHTED AVERAGE      REMAINING AVAILABLE
                                   ISSUED UPON EXERCISE OF      EXERCISE PRICE OF      FOR FUTURE ISSUANCE
                                     OUTSTANDING OPTIONS,      OUTSTANDING OPTIONS      UNDER THE EQUITY
                                     WARRANTS AND RIGHTS       WARRANTS AND RIGHTS      COMPENSATION PLAN
                                 ---------------------------   -------------------    --------------------
                                                                                        
Equity Compensation Plans
approved by security holders                               0                   N/A                       0

Equity compensation plans not
approved by security holders                       1,794,500                $  .89               3,205,500

Total                                              1,794,500                $  .89               3,205,500


ELECTRONIC SENSOR TECHNOLOGY, INC. 2005 STOCK INCENTIVE PLAN


        In 2005, the Board of Directors adopted the Electronic Sensor
Technology, Inc. 2005 Stock Incentive Plan. The purpose of the Stock Incentive
Plan is to attract and retain the services of experienced and knowledgeable
individuals to serve as our employees, consultants and directors. On the date
the Stock Incentive Plan was adopted, the total number of shares of common stock
subject to it was 5,000,000. The Stock Incentive Plan is currently administered
by the Board of Directors, and may be administered by any Committee that
authorized by the Board of Directors, so long as any such Committee is made up
of Non-Employee Directors, as that term is defined in Rule 16(b)-3(b) of the
Securities Exchange Act of 1934.

        The Stock Incentive Plan is divided into two separate equity programs:
the Discretionary Option Grant Program and the Stock Issuance Program. Under the
Discretionary Option Grant Program, eligible persons may, at the discretion of
the administrator, be granted options to purchase shares of common stock and
stock appreciation rights. Under the Stock Issuance Program, eligible persons
may, at the discretion of the administrator, be issued shares of common stock
directly, either through the immediate purchase of such shares or as a bonus for
services rendered for Electronic Sensor Technology (or a parent or subsidiary of
Electronic Sensor Technology).

        Pursuant to the terms of the Discretionary Option Grant Program, the
exercise price per share is fixed by the administrator, but may not be less than
85% of the fair market value of the common stock on the date of grant, unless
the recipient of a grant owns 10% or more of Electronic Sensor Technology's
common stock, in which case the exercise price of the option must not be less
than 110% of the fair market value. An option grant may be subject


                                      -35-



to vesting conditions. Options may be exercised in cash, with shares of the
common stock of Electronic Sensor Technology already owned by the person or
through a special sale and remittance procedure, provided that all applicable
laws relating to the regulation and sale of securities have been complied with.
This special sale and remittance procedure involves the optionee concurrently
providing irrevocable written instructions to: (i) a designated brokerage firm
to effect the immediate sale of the purchased shares and remit to Electronic
Sensor Technology, out of the sale proceeds available on the settlement date,
sufficient funds to cover the aggregate exercise price payable for the purchased
shares plus all applicable federal, state and local income and employment taxes
required to be withheld by Electronic Sensor Technology by reason of such
exercise and (ii) Electronic Sensor Technology to deliver the certificates for
the purchased shares directly to such brokerage firm in order to complete the
sale. The term of an option granted pursuant to the Discretionary Option Grant
Program may not be more than 10 years.

        The Discretionary Option Grant Program also allows for the granting of
Incentive Options to purchase common stock, which may only be granted to
employees, and are subject to certain dollar limitations. Any options granted
under the Discretionary Option Grant Program that are not Incentive Options are
considered Non-Statutory Options and are governed by the aforementioned terms.
The exercise price of an Incentive Option must be no less than 100% of the fair
market value of the common stock on the date of grant, unless the recipient of
an award owns 10% or more of Electronic Sensor Technology's common stock, in
which case the exercise price of an incentive stock option must not be less than
110% of the fair market value. The term of an Incentive Option granted may not
be more than five years if the option is granted to a recipient who owns 10% or
more of Electronic Sensor Technology's common stock, or 10 years for all other
recipients of Incentive Options. Incentive Options are otherwise governed by the
general terms of the Discretionary Option Grant Program.

        Pursuant to the terms of the Stock Issuance Program, the purchase price
per share of common stock issued is fixed by the administrator, but may not be
less than 85% of the fair market value of the common stock on the issuance date,
unless the recipient of a such common stock owns 10% or more of Electronic
Sensor Technology's common stock, in which case the purchase price must not be
less than 100% of the fair market value. Common stock may be issued in exchange
for cash or past services rendered to Electronic Sensor Technology (or any
parent or subsidiary of Electronic Sensor Technology). Common stock issued may
be fully and immediately vested upon issuance or may vest in one or more
installments, at the discretion of the administrator.


                             EXECUTIVE COMPENSATION


        For the fiscal years ended December 31, 2003 and December 31, 2004 and
for the period from January 1, 2005 through January 31, 2005, no salary or any
other compensation was paid to any named executive officer of Bluestone for
services provided to us. The table below outlines the compensation of the named
executive officers of Electronic Sensor Technology for the fiscal year ended
December 31, 2005, beginning on February 1, 2005, the date upon which Electronic
Sensor Technology, Inc. acquired Electronic Sensor Technology, L.P.:


                                      -36-



                           SUMMARY COMPENSATION TABLE


                                                                                 LONG-TERM COMPENSATION
                                                                        ------------------------------------------
                                                         ANNUAL
                                                      COMPENSATION                         AWARDS
                                                                                                   SECURITIES
                                                                          RESTRICTED STOCK         UNDERLYING
                NAME AND                                 SALARY               AWARD(S)            OPTIONS/SARS
           PRINCIPAL POSITION               YEAR           ($)                 ($)(6)                  (#)
--------------------------------------     ------   -----------------   --------------------   -------------------
                                                                                            
Matthew Collier, President and Chief
 Executive Officer (May 26,
 2005-January 25, 2006)                     2005              135,384              24,750 (1)              500,000

Edward Staples, President and Chief
 Executive Officer (February 1, 2005-May
 26, 2005), Chief Scientific Officer (May
 26, 2005-present)                          2005              132,411                      0            100,000 (2)

Francis Chang, Secretary and Vice
 President of Finance and Administration    2005              123,888                      0             80,000 (3)

Teong Lim, Vice President of Corporate
 Development                                2005              111,316                      0             80,000 (4)

Gary Watson, Vice President of
 Engineering                                2005              120,898                      0            175,000 (5)


(1)   Matthew Collier was granted, on May 26, 2005, the right to receive
75,000 shares of restricted common stock, subject to approval by the Board of
Directors, pursuant to a letter agreement of employment entered into with
Electronic Sensor Technology. On January 25, 2006, Mr. Collier was granted
75,000 shares of restricted common stock, subject to a right of first refusal on
the part of Electronic Sensor Technology in the event Mr. Collier decides to
sell such shares. Such shares have been valued, for purposes of the Summary
Compensation Table, at $0.33 per share, the closing quotation on the
Over-the-Counter Bulletin Board on January 25, 2006.

(2)   Edward Staples was granted options to purchase 100,000 limited partnership
interests of Electronic Sensor Technology, L.P. at $1.00 per limited partnership
interest on December 31, 2003. Such options were terminated in connection with
the merger whereby Electronic Sensor Technology, L.P. became an indirect
subsidiary of Electronic Sensor Technology, Inc., and were replaced with options
to purchase 100,000 shares of common stock at $1.00 per share.

(3)   Francis Chang was granted options to purchase 80,000 limited partnership
interests of Electronic Sensor Technology, L.P. at $1.00 per limited partnership
interest on December 31, 2003. Such options were terminated in connection with
the merger whereby Electronic Sensor Technology, L.P. became an indirect
subsidiary of Electronic Sensor Technology, Inc., and were replaced with options
to purchase 80,000 shares of common stock at $1.00 per share.

(4)   Teong Lim was granted options to purchase 80,000 limited partnership
interests of Electronic Sensor Technology, L.P. at $1.00 per limited partnership
interest on December 31, 2003. Such options were terminated in connection with
the merger whereby Electronic Sensor Technology, L.P. became an indirect
subsidiary of Electronic Sensor Technology, Inc., and were replaced with options
to purchase 80,000 shares of common stock at $1.00 per share.

(5)   Gary Watson was granted options to purchase (i) 50,000 limited partnership
interests of Electronic Sensor Technology, L.P. at $1.00 per limited partnership
interest on March 15, 1999, (ii) 50,000 limited partnership interests of
Electronic Sensor Technology, L.P. at $1.05 per limited partnership interest on
July 1, 2000, (iii) 50,000 limited partnership interests of Electronic Sensor
Technology, L.P. at $1.05 per limited partnership interest on May 15, 2001 and
(iv) 25,000 limited partnership interests of Electronic Sensor Technology, L.P.
at $1.05 per limited partnership interest on September 15, 2002. Such options
were terminated in connection with the merger whereby Electronic Sensor
Technology, L.P. became an indirect subsidiary of Electronic Sensor Technology,
Inc., and were replaced with options to purchase 50,000 shares of common stock
at $1.00 per share and options to purchase 125,000 shares of common stock at
$1.05 per share.


                                      -37-



(6)   As of December 31, 2005, there were no shares of restricted common
stock of Electronic Sensor Technology outstanding. Only a right to receive
75,000 shares of restricted common stock, subject to approval by the Board of
Directors, was held by Matthew Collier as of December 31, 2005. On January 25,
2006, the 75,000 shares of restricted common stock were issued to Mr. Collier,
valued at $24,750, in the aggregate, for purposes of the Summary Compensation
Table. Such shares of restricted common stock have been valued, for purposes of
the Summary Compensation Table, at $0.33 per share, the closing quotation on the
Over-the-Counter Bulletin Board on January 25, 2006, the date of the grant of
restricted common stock. The 75,000 shares were all fully vested on the date of
the grant, but are restricted by a right of first refusal on the part of
Electronic Sensor Technology in the event Mr. Collier decides to sell such
shares. Aside from the right of first refusal on our part, the shares of
restricted common stock carry the same rights and privileges as our unrestricted
shares of common stock, including the right to receive dividends, if any.


        Individual grants of stock options (whether or not in tandem with stock
appreciation rights (SARs)), and freestanding SARs made during the fiscal year
ended December 31, 2005 to each of the named executed officers are outlined in
the table below:

                    OPTION/SAR GRANTS IN THE LAST FISCAL YEAR
                               (Individual Grants)


                                       PERCENT OF
                      NUMBER OF          TOTAL
                     SECURITIES       OPTIONS/SARS
                     UNDERLYING        GRANTED TO      EXERCISE OF
                    OPTIONS/SARS      EMPLOYEES IN     BASE PRICE
NAME                 GRANTED (#)       FISCAL YEAR       ($/SH)        EXPIRATION DATE
---------------    --------------   ---------------   --------------   -----------------
                                                              
Matthew Collier           500,000               100%             .64      May 26, 2015
Edward Staples                 (1)
Francis Chang                  (2)
Teong Lim                      (3)
Gary Watson                    (4)



(1)   Edward Staples was granted options to purchase 100,000 limited partnership
interests of Electronic Sensor Technology, L.P. at $1.00 per limited partnership
interest on December 31, 2003. Such options were terminated in connection with
the merger whereby Electronic Sensor Technology, L.P. became an indirect
subsidiary of Electronic Sensor Technology, Inc., and were replaced with options
to purchase 100,000 shares of common stock at $1.00 per share. In connection
with such merger, Dr. Staples also received a warrant to purchase 343,708 shares
of common stock at $1.00 per share in exchange for the cancellation of debt owed
by Electronic Sensor Technology, L.P. The warrant was issued to Dr. Staples
solely in exchange for the cancellation of such debt, and not as compensation.

(2)   Francis Chang was granted options to purchase 80,000 limited partnership
interests of Electronic Sensor Technology, L.P. at $1.00 per limited partnership
interest on December 31, 2003. Such options were terminated in connection with
the merger whereby Electronic Sensor Technology, L.P. became an indirect
subsidiary of Electronic Sensor Technology, Inc., and were replaced with options
to purchase 80,000 shares of common stock at $1.00 per share. In connection with
such merger, Mr. Chang also received a warrant to purchase 257,247 shares of
common stock at $1.00 per share in exchange for the cancellation of debt owed by
Electronic Sensor Technology, L.P. The warrant was issued to Mr. Chang solely in
exchange for the cancellation of such debt, and not as compensation.

(3)   Teong Lim was granted options to purchase 80,000 limited partnership
interests of Electronic Sensor Technology, L.P. at $1.00 per limited partnership
interest on December 31, 2003. Such options were terminated in connection with
the merger whereby Electronic Sensor Technology, L.P. became an indirect
subsidiary of Electronic Sensor Technology, Inc., and were replaced with options
to purchase 80,000 shares of common stock at $1.00 per share. In connection with
such merger, Dr. Lim also received a warrant to purchase 438,796 shares of
common stock at $1.00 per share in exchange for the cancellation of debt owed by
Electronic Sensor Technology, L.P. The warrant was issued to Dr. Lim solely in
exchange for the cancellation of such debt, and not as compensation.


                                      -38-



(4)   Gary Watson was granted options to purchase (i) 50,000 limited partnership
interests of Electronic Sensor Technology, L.P. at $1.00 per limited partnership
interest on March 15, 1999, (ii) 50,000 limited partnership interests of
Electronic Sensor Technology, L.P. at $1.05 per limited partnership interest on
July 1, 2000, (iii) 50,000 limited partnership interests of Electronic Sensor
Technology, L.P. at $1.05 per limited partnership interest on May 15, 2001 and
(iv) 25,000 limited partnership interests of Electronic Sensor Technology, L.P.
at $1.05 per limited partnership interest on September 15, 2002. Such options
were terminated in connection with the merger whereby Electronic Sensor
Technology, L.P. became an indirect subsidiary of Electronic Sensor Technology,
Inc., and were replaced with options to purchase 50,000 shares of common stock
at $1.00 per share and options to purchase 125,000 shares of common stock at
$1.05 per share.

       AGGREGATED OPTION/SAR EXERCISES IN THE LAST FISCAL YEAR AND FY-END
                                OPTION/SAR VALUES

                                                  NUMBER OF
                                                  SECURITIES         VALUE OF
                                                  UNDERLYING        UNEXERCISED
                    SHARES                        UNEXERCISED      IN-THE-MONEY
                   ACQUIRED                       OPTIONS/SARS     OPTIONS/SARS
                      ON            VALUE        AT FY-END (#)     AT FY-END ($)
                   EXERCISE        REALIZED       EXERCISABLE/     EXERCISABLE/
NAME                  (#)            ($)         UNEXERCISABLE    UNEXERCISABLE
---------------   -----------   -------------   ---------------   --------------
Matthew Collier       N/A            N/A        0/500,000             N/A
Edward Staples        N/A            N/A        100,000/0             N/A
Francis Chang         N/A            N/A         80,000/0             N/A
Teong Lim             N/A            N/A         80,000/0             N/A
Gary Watson           N/A            N/A        175,000/0             N/A


COMPENSATION OF DIRECTORS


        Commencing April 2005, each director who is not an employee is paid
$2,500 per meeting. Mr. Frey, as the Chairman of the Board of Directors, is also
provided with a business class airline ticket for meetings requiring more than
two hours travel, and out-of-pocket expenses. On October 7, 2005, Mr. Frey was
granted 250,000 non-qualified stock options to acquire common stock at an
exercise price of $0.64 per share, under our 2005 Stock Incentive Plan. Mr.
Frey's stock options will vest as follows: one quarter of the options will vest
on March 8, 2006, one quarter on September 8, 2006, one quarter on March 8, 2007
and one quarter on September 8, 2007, provided he is still participating as a
member of our Board of Directors at the end of each such six-month period.


EMPLOYMENT CONTRACTS


        On May 16, 2005, Electronic Sensor Technology entered into a letter
agreement with Matthew Collier, who was appointed President and Chief Executive
Officer on May 26, 2005. Pursuant to the letter agreement, Mr. Collier agreed to
serve as President and Chief Executive Officer of Electronic Sensor Technology
for at an annual salary of $220,000 per year and a potential target bonus of 25%
of such annual salary, to be paid at the discretion of the Board of Directors.
The letter agreement also provides for a grant of 75,000 shares of restricted
common stock that may be traded one year from Mr. Collier's date of employment
and an additional 75,000 shares of restricted common stock to be granted one
year from Mr. Collier's date of employment, if Mr. Collier remains an employee
of Electronic Sensor Technology, tradable on the first anniversary of such
grant. The letter agreement also provides for a grant of 500,000 options to
purchase common stock, 33% of which will vest on each of the first and second
anniversaries of Mr. Collier's date of employment and the remaining 34% of which
will vest on the third anniversary of Mr. Collier's date of employment. On
January 25, 2006, the letter agreement with Mr. Collier was mutually terminated
by Mr. Collier and Electronic Sensor Technology (other than that portion of the
letter


                                      -39-



agreement relating to indemnification of Mr. Collier for liability
incurred within the scope of his employment with the Registrant, embodied in
Section 7 of the letter agreement), by way of a Settlement Agreement, Mutual
Release and Amendment of Option Agreement entered into between Mr. Collier and
Electronic Sensor Technology in connection with the resignation of Mr. Collier
as President and Chief Executive Officer and a director of Electronic Sensor
Technology, effective January 25, 2006.

        Other than the terminated letter agreement with Mr. Collier, we have no
employment agreements with any of our named executive officers, nor do we have
any compensatory plans or arrangements with respect to any named executive
officers that results or will result from the resignation, retirement or any
other termination of such executive officer's employment with Electronic Sensor
Technology or from a change-in-control of Electronic Sensor Technology or a
change in the named executive officer's responsibilities following a
change-in-control wherein the amount involved, including all periodic payments
or installments, exceeds $100,000.


REPORT ON REPRICING OF OPTIONS/SARs


        On May 26, 2005, Matthew Collier, former President and Chief Executive
Officer of Electronic Sensor Technology, entered into a letter agreement of
employment with Electronic Sensor Technology pursuant to which we agreed to
grant Mr. Collier options to purchase 500,000 shares of common stock at an
exercise price of $1.50 per share, subject to approval by the Board of
Directors. On September 8, 2005, the Board of Directors approved the granting of
such options and also approved a repricing of the options from the $1.50 per
share exercise price stated in the May 26, 2005 letter agreement to $0.64 per
share, the closing price of the common stock on September 8, 2005. On October 7,
2005, Electronic Sensor Technology entered into an Option Agreement with Mr.
Collier, substantially in the form attached as Exhibit 10.2 to our annual report
on Form 10-KSB for the fiscal year ended December 31, 2004 filed with the
Commission on April 15, 2005 for the granting of options to purchase 500,000
shares of common stock at an exercise price of $0.64 per share.


                                      -40-


                              FINANCIAL STATEMENTS

INDEX TO FINANCIAL STATEMENTS

Electronic Sensor Technology, L.P. Audited Financial Statements for the
Years Ended December 31, 2004 and 2003

Report of Independent Registered Public Accounting Firm                      F-1

Balance Sheet at December 31, 2004                                           F-2

Statements of Operations for the Years Ended
December 31, 2004 and 2003                                                   F-3

Statements of Cash Flows for the Years Ended
December 31, 2004 and 2003                                                   F-4

Statement of Changes in Partners' Deficit for the Years Ended
December 31, 2004, 2003 and 2002                                             F-5

Notes to Financial Statements                                                F-6

Electronic Sensor Technology, Inc. Unaudited Financial Statements for the
Three Months and Nine Months Ended September 30, 2005

Consolidated Balance Sheet at September 30, 2005                            F-12

Consolidated Statements of Operations for the Three Months
and Nine Months Ended September 30, 2005 and 2004                           F-13

Consolidated Statements of Cash Flows for the Three Months
and Nine Months Ended September 30, 2005 and 2004                           F-14

Notes to Consolidated Financial Statements                                  F-15

                                      -41-


             REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Board of Directors and Stockholders
Electronic Sensor Technology, L.P.

        We have audited the accompanying balance sheet of Electronic Sensor
Technology, L.P. as of December 31, 2004 and the related consolidated statements
of operations, partners' deficit and cash flows for the years ended December 31,
2004 and 2003. These financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
financial statements based on our audit.

        We conducted our audit in accordance with the standards of the Public
Company Accounting Oversight Board (United States). Those standards require that
we plan and perform the audit to obtain reasonable assurance about whether the
financial statements are free of material misstatement. An audit includes
examining on a test basis, evidence supporting the amounts and disclosures in
the financial statements. An audit also includes assessing the accounting
principles used and significant estimates made by management, as well as
evaluating the overall financial statement presentation. We believe that our
audit provides a reasonable basis for our opinion.

        In our opinion, the financial statements referred to above present
fairly, the consolidated financial position of Electronic Sensor Technology,
L.P., as of December 31, 2004 and the consolidated results of its operations and
its cash flows for the years ended December 31, 2004 and 2003 in conformity with
accounting principles generally accepted in the United States of America.


                                                    /s/  Sherb & Co., LLP
                                                    ----------------------------
                                                    Sherb & Co., LLP
                                                    Certified Public Accountants

New York, New York
March 31, 2005

                                       F-1


                       ELECTRONIC SENSOR TECHNOLOGY, L.P.

                                  BALANCE SHEET

                                DECEMBER 31, 2004

                                     ASSETS

CURRENT ASSETS:
  Cash and cash equivalents                          $    26,205
  Accounts receivable, net of allowance for
   doubtful accounts of $28,923                           30,687
  Prepaid expenses                                        14,257
  Inventories                                            480,648
                                                     -----------
      TOTAL CURRENT ASSETS                               551,797
PROPERTY AND EQUIPMENT                                    51,199
SECURITY DEPOSITS                                         12,957
                                                     -----------
                                                     $   615,953
                                                     ===========


                        LIABILITIES AND PARTNERS' DEFICIT

CURRENT LIABILITIES:
  Line of credit                                      $ 1,969,137
  Accounts payable and accrued expenses                   212,802
  Notes payable - related parties                       1,272,000
  Due to related party                                     60,000
  Partners' loans payable                               1,308,630
  Interest payable                                        333,455
  Accrued compensation due to partners'                   934,957
  Other current liabilities                                35,665
                                                     ------------
   TOTAL CURRENT LIABILITIES                            6,126,646
PARTNERS' DEFICIT                                      (5,510,693)
                                                     ------------
                                                     $    615,953
                                                     ============

                        See notes to financial statements

                                       F-2


                       ELECTRONIC SENSOR TECHNOLOGY, L.P.

                            STATEMENTS OF OPERATIONS

                                                              YEAR ENDED
                                                              DECEMBER 31,
                                                     ---------------------------
                                                         2004           2003
                                                     ------------   ------------
REVENUES                                            $  1,268,416   $  1,242,296
COST OF SALES                                          1,039,280      1,143,350
                                                     ------------   ------------
  GROSS PROFIT                                           229,136         98,946
                                                     ------------   ------------
OPERATING EXPENSES:
  Compensation                                            81,734         80,601
  Selling                                                161,546        114,124
  General and administrative                             282,305        219,646
                                                     ------------   ------------
  TOTAL OPERATING EXPENSES                               525,585        414,371
                                                     ------------   ------------
LOSS FROM OPERATIONS                                    (296,449)      (315,425)
                                                     ------------   ------------
OTHER INCOME AND EXPENSE:
  Other income                                            57,076            264
  Gain (loss) on sale of property and equipment           (7,710)         1,182
  Interest expense                                      (164,133)       (80,418)
                                                     ------------   ------------
  TOTAL OTHER INCOME AND EXPENSE                        (114,767)       (78,972)
                                                     ------------   ------------

NET LOSS                                            $   (411,216)  $   (394,397)
                                                     ============   ============

                        See notes to financial statements

                                      F-3


                       ELECTRONIC SENSOR TECHNOLOGY, L.P.

                            STATEMENTS OF CASH FLOWS
                                                               YEAR ENDED
                                                               DECEMBER 31,
                                                    ---------------------------
                                                        2004            2003
                                                    ------------   ------------
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net loss                                          $   (411,216)  $   (394,397)
  Adjustments to reconcile net loss to net
   cash used in operating activities:
    Depreciation and amortization                         11,223         10,467
    Note payable related party - interest waived          63,774              -
  Changes in assets and liabilities:
    Accounts receivable                                  363,042       (320,678)
    Inventories                                         (87,544)          6,768
    Prepaid expenses                                       2,312          2,040
    Due to related party                                 (40,910)       125,000
    Accounts payable and accrued expenses                (66,120)        96,029
    Interest payable                                       4,364         31,048
    Other current liabilities                             (6,773)        (9,216)
                                                    ------------   ------------
NET CASH USED IN OPERATING ACTIVITIES                   (167,848)      (452,939)
                                                    ------------   ------------

CASH FLOWS FROM INVESTING ACTIVITIES:
  Purchase of property and equipment                     (35,113)       (51,233)
  Proceeds from the sale of property and equipment        12,198         13,302
NET CASH USED IN INVESTING ACTIVITIES                    (22,915)       (37,931)
                                                    ------------   ------------

CASH FLOWS FROM FINANCING ACTIVITIES:
  Increase to line of credit                              17,000        644,038
  Proceeds from partners' loans                                -        498,689
  Payment of partners' loans                            (120,000)             -
  Sale of Partnership Interest - Class C                 200,000              -
  Private placement in escrow                                  -       (531,889)
NET CASH PROVIDED BY FINANCING ACTIVITIES                 97,000        610,838

NET (DECREASE) INCREASE IN CASH                          (93,763)       119,968

CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR           119,968              -
                                                    ------------   ------------
CASH AND CASH EQUIVALENTS AT END OF YEAR            $     26,205   $    119,968
                                                    ============   ============
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
  Cash paid during the year for:
   Interest                                         $     87,284   $     80,418
                                                    ============   ============

                 See notes to consolidated financial statements.

                                       F-4





                       ELECTRONIC SENSOR TECHNOLOGY, L.P.
                    STATEMENT OF CHANGES IN PARTNERS' DEFICIT

BALANCE - December 31, 2002                                        $ (4,968,854)
  Net loss                                                             (394,397)
                                                                    ------------
BALANCE - December 31, 2003                                          (5,363,251)
  Sale of Partnership interest  - Class C                                200,000
  Net loss                                                             (411,216)
  Note Payable related party - interest waived                            63,774
                                                                    ------------
BALANCE - December 31, 2004                                        $ (5,510,693)
                                                                    ============


                 See notes to consolidated financial statements.

                                       F-5


                       ELECTRONIC SENSOR TECHNOLOGY, L.P.
                          Notes to Financial Statements
                           December 31, 2004 and 2003

(1)  NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

  (a)  NATURE OF BUSINESS

       Electronic Sensor Technology L.P. (Partnership) is a California limited
       partnership formed on April 1, 1995. The partnership develops and
       manufactures electronic devices used for vapor analysis.

       In November 2004, Electronic Sensor Technology L.P. sold 200,000 class C
       units of Partnership Interest for $200,000. The Purchasers shall be able
       to exchange their Partnership Units into Bluestone Ventures Inc. (see
       Subsequent Events Footnote for further discussion) common stock - Class
       C and warrants such that each Partnership Unit shall be exchanged for
       one share of common stock and a warrant to purchase one share of common
       stock at $1.00 per share for three years. (See Subsequent Events
       Footnote for further discussion).

       The Partnership has authorized 960,000 Class A units and 40,000 Class B
       units, all of which are outstanding as of December 31, 2004. The
       differences between Class A and B units relate to the allocation of
       profits and losses. The allocation of profits is based on each partner's
       respective ownership interest in the Partnership. Allocation of losses,
       credits and deductions is computed in the same manner as the allocation
       of profit except no net loss shall be allocated to any limited partner
       with a negative capital account balance or if such allocation would
       create a negative capital balance. The excess losses will be allocated
       to the general partner, who shall thereafter be entitled to 100% of net
       income to the extent of such prior excess loss allocations.

       The ownership interests of the partners as of December 31, 2004 and 2003
       are as follows:

                                                              2004      2003
                                                            -------   ------
         General partner (Class A unit holder)                 42.5%       51%
         Limited partners (Class A, B and C unit holders)      57.5%       49%
                                                             -----------------
                                                               100%       100%
                                                             =================

  (b)  CASH AND CASH EQUIVALENTS


       The Partnership considers highly liquid financial instruments with
       maturities of three months or less at the time of purchase to be cash
       equivalents. Electronic Sensor Technology did not have any cash
       equivalents at December 31, 2004 and 2003.

  (c)  REVENUE RECOGNITION

       The Partnership records revenue from direct sales of products to
       end-users when the products are shipped, collection of the purchase
       price is probable and Electronic Sensor Technology has no significant
       further obligations to the customer. Costs of remaining insignificant
       Company obligations, if any, are accrued as costs of revenue at the time
       of revenue recognition. Cash payments received in advance of product or
       service revenue are recorded as deferred revenue.


  (d)  CONCENTRATIONS OF CREDIT RISK

       The Partnership had sales to two significant customers constituting 20%
       and 10% of sales in 2004. Additionally, these customers comprised 65%
       and less than 1% of accounts receivable at December 31, 2004. The
       Partnership had sales to one significant customer constituting 15% of
       sales in 2003. This customer comprised 48% of accounts receivable at
       December 31, 2003.

                                       F-6


  (e)  SHIPPING AND HANDLING

       The Partnership accounts for shipping and handling costs as a component
       of "Cost of Sales".

  (f)  PROPERTY AND EQUIPMENT

       Property and equipment are stated at cost, net of accumulated
       depreciation. Depreciation is computed using the straight-line method
       over the estimated useful lives of five years.

  (g)  INVENTORIES

       Inventories are comprised of raw materials, work in process, and
       finished goods. Inventories are stated at the lower of cost or market
       and are determined using the first-in, first-out method.

  (h)  INCOME TAXES

       The Partnership is not subject to income taxes as the results of
       operations flows through to the respective individual partner's tax
       returns. Accordingly, no provision for income taxes has been recorded in
       the accompanying financial statements.

  (i)  USE OF ESTIMATES

       The preparation of the financial statements in conformity with generally
       accepted accounting principles requires management to make estimates and
       assumptions that affect the reported amounts of assets and liabilities
       and disclosures of contingent assets and liabilities at the date of the
       financial statements and the recorded amounts of revenues and expenses
       during the reporting period. Actual results could differ from those
       estimates.

  (j)  FAIR VALUE OF FINANCIAL INSTRUMENTS

       The fair value of certain financial instruments, including accounts
       receivable, accounts payable and accrued liabilities, approximates their
       carrying value due to the short maturity of these instruments.

  (k)  LONG-LIVED ASSETS

       The Partnership reviews long-lived assets, such as property and
       equipment, to be held and used or disposed of, for impairment whenever
       events or changes in circumstances indicate that the carrying amount of
       an asset may not be recoverable. If the sum of the expected cash flows,
       undiscounted and without interest, is less than the carrying amount of
       the asset, an impairment loss is recognized as the amount by which the
       carrying amount of the asset exceeds its fair value At December 31, 2004
       no assets were impaired.

  (l)  RECENT ACCOUNTING PRONOUNCEMENTS

       In November 2004, the FASB issued Statement of Financial Accounting
       Standards No. 151, "Inventory Costs - an amendment of ARB No. 43,
       Chapter 4". This Statement amends the guidance in ARB No. 43, Chapter 4,
       "Inventory Pricing", to clarify the accounting for abnormal amounts of
       idle facility expense, freight, handling costs, and wasted material
       (spoilage). This Statement requires that those items be recognized as
       current-period charges regardless of whether they meet the criterion of
       "so abnormal". In addition, this Statement requires that allocation of
       fixed production overheads to the costs of conversion be based on the
       normal capacity of the production facilities. Electronic Sensor
       Technology does not have inventory costs and therefore does not expect
       to be impacted by SFAS 151 or be required to make additional
       disclosures.

       In December 2004, the FASB issued Statement of Financial Accounting
       Standards No. 152, "Accounting for Real Estate Time-Sharing Transactions
       - an amendment of FASB Statements No. 66 and 67". This

                                       F-7


       Statement amends SFAS 66, "Accounting for Sale of Real Estate", to
       reference the financial accounting and reporting guidance for
       real-estate time-sharing transactions that is provided in AICPA
       Statement of Position 04-2, "Accounting for Real Estate Time-Sharing
       Transactions". This Statement also amends SFAS 67, "Accounting for Costs
       and Initial Rental Operations of Real Estate Projects", to state that
       the guidance for (a) incidental operations and (b) costs incurred to
       sell real estate projects does not apply to real estate time-sharing
       transactions. The accounting for those operations and costs is subject
       to the guidance in SOP 04-2. Electronic Sensor Technology does not
       expect to be impacted by the adoption of SFAS 152, which will be
       effective for financial statements for fiscal years beginning after June
       15, 2005.

       In December 2004, the FASB issued Statement of Financial Accounting
       Standards No. 153, "Exchanges of Non monetary Assets - an amendment of
       APB Opinion No. 29". This Statement amends Opinion 29 to eliminate the
       exception for non monetary exchanges of similar productive assets and
       replaces it with a general exception for exchanges of non monetary
       assets that do not have commercial substance. A non monetary exchange
       has commercial substance if the future cash flows of the entity are
       expected to change significantly as a result of the exchange. The
       adoption of SFAS 153 did not impact Electronic Sensor Technology's
       financial position or results of operations.

       In December 2004, the FASB revised Statement of Financial Accounting
       Standards No. 123, "Accounting for Stock-Based Compensation". This
       Statement supersedes APB Opinion No. 25, "Accounting for Stock Issued to
       Employees". This Statement establishes standards for the accounting for
       transactions in which an entity exchanges its equity instruments for
       goods and services. It also addresses transactions in which an entity
       incurs liabilities in exchange for goods and services that are based on
       the fair value of the entity's equity instruments or may be settled by
       the issuance of those equity instruments. This Statement focuses
       primarily on accounting for transactions in which an entity obtains
       employee services in share-based payment transactions. Electronic Sensor
       Technology is in the process of assessing the effect of the revised SFAS
       123 and does not expect its adoption will have a material effect on
       Electronic Sensor Technology's financial position or results of
       operations.

       Management does not believe that any recently issued, but not yet
       effective accounting pronouncements if currently adopted would have a
       material effect on the accompanying consolidated financial statements.

(2)  PROPERTY AND EQUIPMENT

       Property and equipment consisted of the following at December 31, 2004:

                                                  2004
                                               ----------
         Machinery and equipment               $  671,555
         Office equipment                         143,301
         Furniture and fixtures                    52,909
         Leasehold improvements                    39,499
         Rental equipment                          39,645
                                               ----------
                                                  946,909
         Accumulated depreciation                (895,710)
                                               ----------
         Property and equipment, net           $   51,199
                                               ==========

       Depreciation and amortization expense for the years ended December 31,
       2004 and 2003 was $11,223 and $10,467, respectively.

                                      F-8


(3)    INVENTORIES

       Inventories at December 31, 2004 represent costs associated with the
       partnership's proprietary vapor sensor systems and consisted of:

                                                  2004
                                               ----------
         Raw materials                         $  184,229
         Work in progress                         168,352
         Finished goods                           128,067
                                               ----------
                                               $   480,648
                                               ==========

(4)    LINE OF CREDIT

       In September 2004, the partnership renewed its revolving line of credit
       agreement for borrowings up to $1,975,000 payable on March 31, 2005.
       Borrowings under this agreement bear interest at prime (5.25% at December
       31, 2004), are guaranteed by certain related parties and are
       collateralized with the assets of the Partnership. At December 31, 2004
       the total amount outstanding under this revolving line of credit was
       $1,969,137. The Partnership has available borrowings under this line of
       credit of $6,000 at December 31, 2004. On March 31, 2005 the Line of
       Credit was renewed by Bluestone ( now known as Electronic Sensor
       Technology, Inc.). (See subsequent events footnote for further
       discussion).

(5)    NOTES PAYABLE - RELATED PARTIES

       On September 12, 1999, the Partnership issued convertible promissory
       notes to its general and limited partners' in consideration of
       $1,000,000. The convertible promissory notes are due September 12, 2005
       and are convertible at the election of the holder into Class A Units or
       Class A Equivalents at a conversion price of $2, on or after the maturity
       date. The notes bear interest at a rate of 5% per annum. At December 31,
       2004 interest due under these notes was $265,000. Interest on this note
       for the year ended December 31, 2004 was forgiven due to cash flow
       problems. The expense was recorded against additional paid-in capital.
       These notes were converted into shares in January 2005. (See subsequent
       events footnote for further discussion).

       The Partnership entered into notes payable to the general partner
       amounting to $272,000 for the year ended December 31, 2004. The notes
       bear interest at 5% per annum. At December 31, 2004 interest due under
       these notes was $48,000. Interest on this note for the year ended
       December 31, 2004 was forgiven due to cash flow problems. These notes are
       due upon the successful closure of a private placement of ownership
       interests. These notes were converted into shares in January 2005. (See
       Subsequent events footnote for further discussion).

(6)    PARTNERS' LOANS PAYABLE

       The Partnership has entered into short-term loans with three partners' of
       the partnership. The notes were non-interest bearing and due on demand.
       The outstanding balance at December 31, 2004 was $1,198,630. The loans
       are due upon successful closure of a private placement of new ownership
       interests. These loans were subsequently converted into stock. (See
       Subsequent Events footnote for further discussion).

       In September 2004, three partners' lent additional funds to the
       Partnership. The agreements were for borrowings up to $100,000, from each
       partner, payable on March 31, 2005. Borrowings under these agreements
       bear interest at prime (4.75% at December 31, 2004) and are guaranteed by
       the officers. At December 31, 2004 the total amount outstanding for these
       loans was $110,000. The loans were paid off in March 2005.

(7)    DUE TO RELATED PARTY

       The Partnership received funds from Amerasia Technology, Inc, a related
       party, for various purposes during the normal course of business. The
       amount due to Amerasia as of December 31, 2004 was $60,000. The amounts
       are non-interest bearing and due on demand.

                                      F-9


(8)    ACCRUED COMPENSATION DUE TO PARTNERSHIP OFFICERS

       Three officers employed by the Partnership have agreed to defer a portion
       of their salaries until such time as the Partnership is financially able
       to meet these financial obligations. The Partnership has recorded
       deferred compensation payable to officers at December 31, 2004 of
       $934,957. In January 2005 these amounts were contributed into equity.

(9)    COMMITMENTS AND CONTINGENCIES

       Leases


       Electronic Sensor Technology rents office space in Newbury Park,
       California. The lease expired in March 2004. Electronic Sensor Technology
       now rents space on a month to month basis.


       Rent expense for the years ended December 31, 2004 and 2003, was
       $155,581 and $158,627, respectively.

(10)   RETIREMENT SAVINGS PLAN

       The Partnership sponsors a 401(k) retirement savings plan (the plan)
       which covers most full-time employees of the Partnership. Employees may
       elect to contribute a percentage of their compensation to the Plan.
       Matching contributions by the Partnership equal 50% of the eligible
       participant's tax-deferred contribution percentage for each payroll
       period of up to a maximum election of 6% per payroll period. During 2004
       and 2003, the partnership contributed $9,982 and $10,250, respectively,
       to the Plan.

(11)   OTHER INCOME


       Other income represents the write-off of a liability of a company that
       discontinued its operations.


(12)   SUBSEQUENT EVENTS

  (a)  MERGERS AND ACQUISITIONS


       Bluestone Ventures Inc. executed an Agreement and Plan of Merger by and
       among Bluestone, Amerasia Technology, Inc., holder of approximately 55%
       of the partnership interests of Electronic Sensor Technology, L.P., L &
       G Sensor Technology, L.P., holder of approximately 45% of the
       partnership interests of Electronic Sensor Technology, L.P., Amerasia
       Acquisition Corp., a wholly-owned subsidiary of Bluestone, and L&G
       Acquisition Corp., a wholly owned subsidiary of Bluestone on January 31,
       2005. Under the merger agreement (i) Amerasia Acquisition merged with
       and into Amerasia Technology such that Amerasia Technology became a
       wholly-owned subsidiary of Bluestone, (ii) L&G Acquisition merged with
       and into L&G Sensor Technology such that L&G Sensor Technology became a
       wholly-owned subsidiary of Bluestone, (iii) as a result of the merger of
       (i) and (ii), Bluestone indirectly acquired all of the partnership
       interests of Electronic Sensor Technology, L.P. and (iv) Bluestone
       issued 20,000,000 shares of its common stock to the shareholders of
       Amerasia Technology and L&G Sensor Technology. This merger has been
       treated as a purchase only on the partnership interests.

       For accounting purposes, the transaction will be treated as a
       recapitalization of Electronic Sensor Technology, L.P. and accounted for
       as a reverse acquisition.

       Bluestone also entered into various Subscription Agreements with certain
       investors on January 31, 2005. Under these Subscription Agreements,
       Bluestone intended to issue 3,985,000 shares of its common stock and
       warrants to purchase 3,985,000 shares of common stock at $1.00 per share
       to certain investors for gross proceeds of $3,985,000. Bluestone received
       the gross proceeds of the sale of these shares on February 1, 2005.
       Bluestone received net proceeds of approximately $3,941,000 less legal
       fees, including counsel fees for the investors and Electronic Sensor
       Technology, L.P. of approximately $163,000.


                                      F-10



       By virtue of the Mergers, all shares of common stock of Amerasia
       Technology were converted into the right to receive shares of common
       stock of Bluestone at an exchange ratio of 4.6223537 shares of Bluestone
       common stock for each share of Amerasia Technology common stock and all
       shares of common stock L&G Sensor Technology were converted into the
       right to receive shares of common stock of Bluestone at an exchange ratio
       of 90 shares of Bluestone common stock for each share of L&G Sensor
       Technology common stock. In addition, all 200,000 Class C limited
       partnership units were automatically converted into 200,000 shares of
       Bluestone common stock.


       The purchase price for the Mergers was 20,000,000 shares of Bluestone
       common stock. The closing of the mergers occurred on February 1, 2005.

  (b)  STOCK OPTION PLAN


       Electronic Sensor Technology adopted an Stock Incentive Option Plan in
       April 2005. There were 969,500 initial options granted to former
       Electronic Sensor Technology, L.P. limited partnership employees.


  (c)  OFFICERS LOANS PAYABLE

       In January 2005 the loans payable to three partners totaling $1,198,630
       were converted into 1,198,630 shares of common stock of Bluestone.

  (d)  NOTES PAYABLE - RELATED PARTIES

       In January 2005 the notes payable to related parties of $1,272,000 plus
       accrued interest were converted into 1,585,111 shares of common stock of
       Bluestone.

  (e)  LINE OF CREDIT

       The line of credit was assigned in March 2005 to Bluestone (now known as
       Electronic Sensor Technology, Inc.) for borrowings up to $1,800,000
       payable on December 31, 2005. Borrowings under this agreement remain
       under similar terms. The loan is collateralized by all the assets of
       Electronic Sensor Technology. As part of such collateral, Electronic
       Sensor Technology also assigned a Certificate of Deposit of $900,000 to
       the bank.

                                      F-11




                       ELECTRONIC SENSOR TECHNOLOGY, INC.

                           CONSOLIDATED BALANCE SHEET

                               SEPTEMBER 30, 2005
                                   (Unaudited)

                                     ASSETS

CURRENT ASSETS:
  Cash and cash equivalents                                       $      220,047
  Certificate of deposit - restricted cash                               912,651
  Accounts receivable, net of allowance for doubtful
   accounts of $20,000                                                   474,764
  Prepaid expenses                                                        43,203
  Inventories                                                            733,843
                                                                  --------------
    TOTAL CURRENT ASSETS                                               2,384,508

PROPERTY AND EQUIPMENT                                                   118,442

SECURITY DEPOSITS                                                         12,817
                                                                  --------------
                                                                  $   2,515,767
                                                                  ==============

                      LIABILITIES AND STOCKHOLDERS' EQUITY

CURRENT LIABILITIES:
  Line of credit                                                  $    1,700,137
  Accounts payable and accrued expenses                                  503,527
                                                                  --------------
    TOTAL CURRENT LIABILITIES                                          2,203,664
                                                                  --------------

STOCKHOLDERS' EQUITY:
  Preferred stock, $.001 par value 50,000,000 shares authorized
   non issued and outstanding                                               -
  Common stock, $.001 par value, 200,000,000
   shares authorized, 53,968,643 issued and outstanding,                  53,969
  Additional paid-in capital                                          12,233,816
  Accumulated deficit                                               (11,975,682)
                                                                  --------------
    TOTAL STOCKHOLDERS' EQUITY                                           312,103
                                                                  --------------
                                                                  $    2,515,767
                                                                  ==============


                 See notes consolidated to financial statements

                                      F-12


                       ELECTRONIC SENSOR TECHNOLOGY, INC.

                      CONSOLIDATED STATEMENTS OF OPERATIONS
                                   (Unaudited)



                                                               NINE MONTHS ENDED             THREE MONTHS ENDED
                                                                 SEPTEMBER 30,                  SEPTEMBER 30,
                                                        -----------------------------   -----------------------------
                                                             2005           2004            2005            2004
                                                        -------------   -------------   -------------   -------------
                                                                                            
REVENUES                                                $   1,380,237   $     958,606   $     753,585   $     175,997

COST OF SALES                                               1,087,064         771,611         381,018         234,268
                                                        -------------   -------------   -------------   -------------
  GROSS PROFIT                                                293,173         186,995         372,567         (58,271)
                                                        -------------   -------------   -------------   -------------

OPERATING EXPENSES:
  Research and development                                    124,145               -         124,145              -
  Compensation                                                332,061          60,112         156,263         17,269
  Selling                                                     359,358         122,980         180,345         38,856
  General and administrative                                1,133,538         277,651         384,766         67,013
                                                        -------------   ------------    -------------   -------------
    TOTAL OPERATING EXPENSES                                1,949,102         460,743         845,519         123,138
                                                        -------------   -------------   -------------   -------------
LOSS FROM OPERATIONS                                       (1,655,929)       (273,748)       (472,952)       (181,409)
                                                        -------------   -------------   -------------   -------------

OTHER INCOME AND EXPENSE:
  Other income                                                     83             166               -          (2,902)
  Gain (loss) on sale of property and equipment                 9,287          (7,711)              -               -
  Interest expense                                            (54,658)        (61,854)        (20,387)        (24,255)
                                                        -------------   -------------   -------------   -------------
    TOTAL OTHER INCOME AND EXPENSE-                           (45,288)        (69,399)        (20,387)        (27,157)
                                                        -------------   -------------   -------------   -------------
NET LOSS                                                $  (1,701,217)  $    (343,147)  $    (493,339)  $    (208,566)
                                                        =============   ============    =============   =============
  Loss per share, basic and diluted                     $       (0.03)  $       (0.01)  $       (0.01)  $       (0.00)
                                                        =============   =============   =============   =============
  Weighted average number of shares, basic and diluted     53,525,865      49,983,643      53,968,643      49,983,643
                                                        =============   =============   =============   =============


                 See notes to consolidated financial statements

                                      F-13


                       ELECTRONIC SENSOR TECHNOLOGY, INC.

                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                                   (Unaudited)



                                                            NINE MONTHS ENDED
                                                               SEPTEMBER 30,
                                                      -----------------------------
                                                           2005            2004
                                                      -------------   -------------
                                                                
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net (loss)                                          $  (1,701,217)  $    (343,147)
  Adjustments to reconcile net income (loss) to net
   cash provided by (used in)operating activities:
    Depreciation and amortization                            11,430           2,641
    Donated services                                              -           6,000
  Changes in assets and liabilities:
    Accounts receivable                                    (444,077)        331,986
    Inventories                                            (253,195)        (86,439)
    Prepaid expenses                                        (28,946)          1,952
    Security deposits                                           140              (2)
    Accounts payable and accrued expenses                   290,725         (39,361)
    Due to related party                                    (60,000)         11,500
    Interest payable                                        (26,961)         (3,340)
    Other current liabilities                               (35,665)         (4,608)
                                                      -------------   -------------
  NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES    (2,247,766)       (122,818)
                                                      -------------   -------------

CASH FLOWS FROM INVESTING ACTIVITIES:
    Proceeds from sale of property and equipment             30,280          (3,826)
    Purchase of property and equipment                     (108,954)              -
                                                      -------------   -------------
  NET CASH (USED IN) OPERATING ACTIVITIES                     (78,674)         (3,826)
                                                      -------------   -------------
CASH FLOWS FROM FINANCING ACTIVITIES:
    Decrease in line of credit                             (269,000)        162,000
    Repayment of partners' loans payable                   (110,000)       (230,000)
    Proceeds from issuance of common stock                3,811,708          74,500
    Income in restricted cash                              (912,651)              -
                                                      -------------   -------------
  NET CASH PROVIDED BY FINANCING ACTIVITIES               2,520,058           6,500
                                                      -------------   -------------
NET INCREASE (DECREASE) IN CASH                           1,106,268        (120,144)

CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD             26,430         121,069
                                                      -------------   -------------
CASH AND CASH EQUIVALENTS AT END OF PERIOD            $     220,046   $         925
                                                      =============   =============
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
  Cash paid during the period for:
    Interest                                          $      67,380   $      61,897
                                                      =============   =============
NON-CASH INVESTING AND FINANCING ACTIVITIES
  Notes payable, loans payable and accrued expenses
   converted into common stock and additional
   paid in capital                                        3,718,849               -
                                                      =============   =============



                 See notes to consolidated financial statements.

                                      F-14


                       ELECTRONIC SENSOR TECHNOLOGY, INC.
                          Notes to Financial Statements
                                   (Unaudited)
                               September 30, 2005

(1)  BASIS  OF  PRESENTATION

     The accompanying unaudited consolidated financial statements have been
     prepared in accordance with generally accepted accounting principles for
     interim financial statements and with the instructions to Form 10-QSB
     and Article 10 of Regulation S-B. Accordingly, they do not include all
     the information and disclosures required for annual financial
     statements. These financial statements should be read in conjunction
     with the consolidated financial statements and related footnotes for the
     year ended December 31, 2004, included in the Annual Report filed on
     Form 10-KSB for the year then ended.


     In the opinion of the management of Electronic Sensor Technology, Inc.
     (formerly Bluestone Ventures Inc.), all adjustments (consisting of
     normal recurring accruals) necessary to present fairly Electronic Sensor
     Technology's financial position as of September 30, 2005, and the
     results of operations and cash flows for the nine month period ending
     September 30, 2005 have been included. The results of operations for the
     nine month period ended September 30, 2005 are not necessarily
     indicative of the results to be expected for the full year. For further
     information, refer to the consolidated financial statements and
     footnotes thereto included in Electronic Sensor Technology's Annual
     Report filed on Form 10-KSB as filed with the Securities and Exchange
     Commission for the year ended December 31, 2004.


(2)  BASIS OF CONSOLIDATION


     The accompanying financial statements include the accounts of Electronic
     Sensor Technology and its wholly owned subsidiaries. All intercompany
     balances and transactions have been eliminated in consolidation.


(3)  NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     (b)  NATURE OF BUSINESS


          Electronic Sensor Technology develops and manufactures electronic
          devices used for vapor analysis.

     (b)  CASH AND CASH EQUIVALENTS


          Electronic Sensor Technology considers highly liquid financial
          instruments with maturities of three months or less at the time of
          purchase to be cash equivalents. Electronic Sensor Technology did not
          have any cash equivalents at September 30, 2005.


     (c)  REVENUE RECOGNITION


          Electronic Sensor Technology records revenue from direct sales of
          products to end-users when the products are shipped, collection of the
          purchase price is probable and Electronic Sensor Technology has no
          significant further obligations to the customer. Costs of remaining
          insignificant Company obligations, if any, are accrued as costs of
          revenue at the time of revenue recognition. Cash payments received in
          advance of product or service revenue are recorded as deferred
          revenue.


     (d)  SHIPPING AND HANDLING


          Electronic Sensor Technology accounts for shipping and handling costs
          as a component of "Cost of Sales".


                                      F-15



     (e)  PROPERTY AND EQUIPMENT

          Property and equipment are stated at cost, net of accumulated
          depreciation. Depreciation is computed using the straight-line method
          over the estimated useful lives of five years.

     (f)  INVENTORIES

          Inventories are comprised of raw materials, work in process, and
          finished goods. Inventories are stated at the lower of cost or
          market and are determined using the first-in, first-out method.

     (g)  USE OF ESTIMATES

          The preparation of the financial statements in conformity with
          generally accepted accounting principles requires management to
          make estimates and assumptions that affect the reported amounts
          of assets and liabilities and disclosures of contingent assets
          and liabilities at the date of the financial statements and the
          recorded amounts of revenues and expenses during the reporting
          period. Actual results could differ from those estimates.

     (h)  FAIR VALUE OF FINANCIAL INSTRUMENTS

          The fair value of certain financial instruments, including
          accounts receivable, accounts payable and accrued liabilities,
          approximates their carrying value due to the short maturity of
          these instruments.

(i)  LONG-LIVED ASSETS

          Electronic Sensor Technology reviews long-lived assets, such as
          property and equipment, to be held and used or disposed of, for
          impairment whenever events or changes in circumstances indicate
          that the carrying amount of an asset may not be recoverable. If
          the sum of the expected cash flows, undiscounted and without
          interest, is less than the carrying amount of the asset, an
          impairment loss is recognized as the amount by which the
          carrying amount of the asset exceeds its fair value. At
          September 30, 2005 no assets were impaired.

(4)  MERGERS AND ACQUISITIONS

     Bluestone Ventures Inc. executed an Agreement and Plan of Merger by and
     among Bluestone, Amerasia Technology, Inc., holder of approximately 55%
     of the partnership interests of Electronic Sensor Technology, L.P., L &
     G Sensor Technology, L.P., holder of approximately 45% of the
     partnership interests of Electronic Sensor Technology, L.P., Amerasia
     Acquisition Corp., a wholly-owned subsidiary of Bluestone, and L&G
     Acquisition Corp., a wholly owned subsidiary of Bluestone on January 31,
     2005. Under the merger agreement (i) Amerasia Acquisition merged with
     and into Amerasia Technology such that Amerasia Technology became a
     wholly-owned subsidiary of Bluestone, (ii) L&G Acquisition merged with
     and into L&G Sensor Technology such that L&G Sensor Technology became a
     wholly-owned subsidiary of Bluestone, (iii) as a result of the merger of
     (i) and (ii), Bluestone indirectly acquired all of the partnership
     interests of Electronic Sensor Technology, L.P. and (iv) Bluestone
     issued 20,000,000 shares of its common stock to the shareholders of
     Amerasia Technology and L&G Sensor Technology. The merger has been
     treated as a purchase only of the partnership interests of Electronic
     Sensor Technology, L.P.

     For accounting purposes, the transaction will be treated as a
     recapitalization of Electronic Sensor Technology, L.P. and accounted
     for as a reverse acquisition.

     Bluestone also entered into various Subscription Agreements with
     certain investors on January 31, 2005. Under these Subscription
     Agreements, Bluestone issued 3,985,000 shares of its common stock and
     warrants to purchase 3,985,000 shares of common stock at $1.00 per
     share to certain investors for gross proceeds of $3,985,000. Bluestone
     received the gross proceeds of the sale of these shares on February 1,
     2005. Bluestone received net proceeds of approximately $3,822,000. This
     amount was net of legal fees, including counsel fees for the investors
     and Electronic Sensor Technology, L.P. of approximately $163,000.


                                  F-16



  By virtue of the mergers, all shares of common stock of Amerasia
     Technology were converted into the right to receive shares of common
     stock of Bluestone at an exchange ratio of 4.6223537 shares of
     Bluestone common stock for each share of Amerasia Technology common
     stock and all shares of common stock L&G Sensor Technology were
     converted into the right to receive shares of common stock of Bluestone
     at an exchange ratio of 90 shares of Bluestone common stock for each
     share of L&G Sensor Technology common stock. In addition, all 200,000
     Class C limited partnership units of Electronic Sensor Technology, L.P.
     were automatically converted into 200,000 shares of Bluestone common
     stock.

     The purchase price for the mergers was 20,000,000 shares of Bluestone
     common stock. The closing of the mergers occurred on February 1, 2005.

     In January 2005 the loans payable to three partners of Electronic
     Sensor Technology, L.P., totaling $1,198,630 were converted into
     1,198,630 shares of common stock of Bluestone.


     In January 2005 the notes payable to related parties of $1,272,000 plus
     accrued interest were converted into 1,585,111 shares of common stock
     of Bluestone. Bluestone has changed its name to Electronic Sensor
     Technology, Inc. as of February 2005.


     Electronic Sensor Technology adopted a Stock Incentive Option Plan in
     April 2005. There were 969,500 initial options granted to former
     Electronic Sensor Technology, L.P. limited partnership employees.


                                      F-17



                CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON
                       ACCOUNTING AND FINANCIAL DISCLOSURE

        On April 18, 2005, Electronic Sensor Technology engaged Sherb & Co. LLP
as our independent registered public accounting firm.

        Manning Elliott Chartered Accountants resigned as Electronic Sensor
Technology's auditors effective from April 18, 2005. Manning Elliott served as
Bluestone's (now Electronic Sensor Technology) independent auditors for fiscal
years ended December 31, 2004 and December 31, 2003. Manning Elliott's report on
Bluestone's (now Electronic Sensor Technology) consolidated financial statements
for the audit reports fiscal years ended December 31, 2004 and December 31, 2003
did not contain any adverse opinion or disclaimer of opinion and were not
qualified or modified as to uncertainty, audit scope or accounting principles
except as follows: In Manning Elliott's audit reports dated April 7, 2005 and
March 25, 2004 for Bluestone's (now Electronic Sensor Technology) fiscal years
ended December 31, 2004 and December 31, 2003, respectively, Manning Elliott
indicated that: "The accompanying financial statements have been prepared
assuming the Company will continue as a going concern. As discussed in Note 1 to
the financial statements, the Company has not generated any revenue since
inception and will need additional financing to sustain operations. These
factors raise substantial doubt about the Company's ability to continue as a
going concern. Management's plans in regard to these matters are also discussed
in Note 1. The financial statements do not include any adjustments that might
result from the outcome of this uncertainty."

        The decision to change accountants was approved and recommended by the
Board of Directors.

        During the fiscal years ended December 31, 2004 and December 30, 2003
and until Manning Elliott's resignation, there were no disagreements with
Manning Elliott within the meaning of item 304 of regulation S-B or any matter
of accounting principles or practices, financial disclosure, or auditing scope
or procedure, which disagreements if not resolved to Manning Elliott's
satisfaction, would have caused Manning Elliott to make reference to the subject
matter of the disagreements in connection with its reports. During the fiscal
years ended December 31, 2004 and December 31, 2003, until Manning Elliott's
resignation, there were no "reportable events" (as such term is defined in item
304(a)(1)(v) of regulation S-K).

        During Electronic Sensor Technology's two most recent fiscal years and
any subsequent interim period prior to the engagement of Sherb & Co. LLP,
neither Electronic Sensor Technology nor anyone on Electronic Sensor
Technology's behalf consulted with Sherb & Co. LLP, regarding either (i) the
application of accounting principles to a specified transaction, either
contemplated or proposed, or the type of audit opinion that might be rendered on
Electronic Sensor Technology's financial statements or (ii) any matter that was
either the subject of a "disagreement" or a "reportable event."

        Electronic Sensor Technology requested that Manning Elliott review the
disclosure contained in Electronic Sensor Technology's current report filed on
Form 8-K on April 19, 2005, which is reproduced herein, and Manning Elliott
furnished Electronic Sensor Technology with a letter addressed to the Commission
containing any new information, clarification of Electronic Sensor Technology's
expression of Manning Elliott's views, or the respects in which Manning Elliott
did not agree with the statements contained in Electronic Sensor Technology's
current report filed on Form 8-K on April 19, 2005. A copy of Manning Elliott's
letter is included as an Exhibit to this prospectus.

                       WHERE YOU CAN FIND MORE INFORMATION

        We file annual reports on Form 10-KSB, quarterly reports on Form 10-QSB
and current reports on Form 8-K with the SEC. You may read and copy any
materials that Electronic Sensor Technology files with the SEC at the SEC's
Public Reference Room at 450 Fifth Street, N.W., Washington, D.C. 20549. You may
obtain information on the operation of the Public Reference Room by calling the
SEC at 1-800-SEC-0330. The SEC maintains an Internet site that contains reports,
proxy and information statements, and other information regarding issuers that
file electronically with the SEC at: http://www.sec.gov. More information
regarding Electronic Sensor Technology is available at our website:
http://www.znose.com.


                                      -42-




        This prospectus is part of a registration statement on Form SB-2 that we
filed with the SEC. As allowed by SEC rules, this prospectus does not contain
all of the information that is in the registration statement and the exhibits to
the registration statement. For further information about Electronic Sensor
Technology, investors should refer to the registration statement and its
exhibits. A copy of the registration statement and its exhibits may be
inspected, without charge, at the SEC's Public Reference Room or on the SEC's
web site.


        It is important for you to analyze the information in this prospectus,
the registration statement and the exhibits to the registration statement before
you make your investment decision.

          SPECIAL NOTE OF CAUTION REGARDING FORWARD-LOOKING STATEMENTS


        This prospectus and the documents incorporated by reference herein
contain "forward-looking statements" within the meaning of the federal
securities laws. These forward-looking statements are based on our management's
estimates and assumptions and take into account only the information available
at the time the forward-looking statements are made. Although we believe these
estimates and assumptions are and will be reasonable, forward-looking statements
involve risks, uncertainties and other factors that could cause our actual
results to differ materially from those suggested in the forward-looking
statements. Forward-looking statements include the information concerning future
financial performance, business strategy, projected plans and objectives of
Electronic Sensor Technology set forth in this prospectus. The words
"anticipates," "estimates," "projects," "forecasts," "goals," "believes,"
"expects," "intends," and similar expressions are intended to identify such
forward-looking statements. Forward-looking statements are subject to numerous
risks and uncertainties.

        Our actual results, performance or achievement could differ materially
from those expressed in, or implied by, forward-looking statements and,
accordingly, no assurances can be given that any of the events anticipated by
the forward-looking statements will transpire or occur, or if any of them do so,
what impact they will have on the results of operations and financial condition
of Electronic Sensor Technology. The forward-looking statements speak only as of
the date they are made. We do not undertake to update forward-looking statements
to reflect circumstances or events that occur after the date the forward-looking
statements are made.


                                  LEGAL MATTERS


        The validity of the common stock offered hereunder will be passed upon
by [_____________________].


                                     EXPERTS

        The financial statements of Electronic Sensor Technology, L.P. for the
fiscal years ended December 31, 2004 and 2003 included in this prospectus have
been so included in reliance on the report of Sherb & Co., LLP, an independent
registered public accounting firm, given on the authority of said firm as
experts in auditing and accounting.

                                      * * *

                                      -43-



                     [LOGO OF ELECTRONIC SENSOR TECHNOLOGY]


                       ELECTRONIC SENSOR TECHNOLOGY, INC.
                        25,448,983 SHARES OF COMMON STOCK




                                   PROSPECTUS

        We have not authorized anyone to give you any information that differs
from the information in this prospectus. If you receive any different
information, you should not rely on it.

        The delivery of this prospectus shall not, under any circumstances,
create an implication that Electronic Sensor Technology, Inc. is operating under
the same conditions that it was operating under on the date of this prospectus.
Do not assume that the information contained in this prospectus is correct at
any time past the date indicated.

         This prospectus does not constitute an offer to sell, or the
solicitation of an offer to buy, any securities other than the securities to
which it relates.

         This prospectus does not constitute an offer to sell, or the
solicitation of an offer to buy, the securities to which it relates in any
circumstances in which such offer or solicitation is unlawful.


                                 Dated [     ], 2006




                                     PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 24.     INDEMNIFICATION OF DIRECTORS AND OFFICERS.

        Subject to certain limitations, Nevada Revised Statute 78.7502 provides
that "[a] corporation may indemnify any person who was or is a party or is
threatened to be made a party to any threatened, pending or completed action,
suit or proceeding, whether civil, criminal, administrative or investigative,
except an action by or in the right of the corporation, by reason of the fact
that he is or was a director, officer, employee or agent of the corporation, or
is or was serving at the request of the corporation as a director, officer,
employee or agent of another corporation, partnership, joint venture, trust or
other enterprise, against expenses, including attorneys' fees, judgments, fines
and amounts paid in settlement actually and reasonably incurred by him in
connection with the action, suit or proceeding if he . . . [a]cted in good faith
and in a manner which he reasonably believed to be in or not opposed to the best
interests of the corporation, and, with respect to any criminal action or
proceeding, had no reasonable cause to believe his conduct was unlawful."


        Our bylaws provide in pertinent part, with respect to indemnification of
our directors that "[t]he Directors shall cause the Corporation to indemnify a
Director or former Director of the Corporation . . . against all costs, charges
and expenses, including an amount paid to settle an action or satisfy a judgment
.. . . in an action or proceeding to which he is or they are made a party by
reason of his or her being or having been a Director of the Corporation
.. . . including an action brought by the Corporation . . . ."

        With respect to indemnification of officers of Electronic Sensor
Technology, the bylaws provide, in pertinent part, that "[t]he Directors may
cause the Corporation to indemnify an officer, employee or agent of the
Corporation . . . (notwithstanding that he is also a Director) . . . against all
costs, charges and expenses incurred by him or them and resulting from his or
her acting as an officer, employee or agent of the Corporation . . . . In
addition the Corporation shall indemnify the Secretary or an Assistance [sic]
Secretary of the Corporation (if he is not a full time employee of the
Corporation and notwithstanding that he is also a Director) . . . against all
costs, charges and expenses incurred by him or them and arising out of the
functions assigned to the Secretary by the Corporation Act or these Articles
.. . . ."

        Our bylaws also allow our directors to cause Electronic Sensor
Technology to "purchase and maintain insurance for the benefit of a person who
is or was serving as a Director, officer, employee or agent of the Corporation.
.. . against liability incurred by him as a Director, officer, employee or
agent." We maintain a policy of liability insurance that insures its directors
and officers against the cost of defense, settlement or payment of a judgment
under certain circumstances.

        Anyone serving on a committee appointed by the Board of Directors to
administer Electronic Sensor Technology's 2005 Stock Incentive Plan is entitled
to the full indemnification and reimbursement to which members of the Board of
Directors are entitled under the Stock Incentive Plan. Under the terms of the
Stock Incentive Plan, no member of the Board of Directors is liable for any act
or omission made in good faith with respect to the Stock Incentive Plan or any
option grants or stock issuances under the Stock Incentive Plan.


                                      II-1



ITEM 25.     OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

        The expenses in connection with the issuance and distribution of the
securities being registered, other than underwriting discounts and commissions,
are estimated to be as follows:


        SEC registration fee               $  1,516.42
        Printing fees*                     $      0.00
        Legal fees and expenses*           $  0,000.00
        Accounting fees and expenses*      $ 10,000.00
        Miscellaneous*                     $  1,500.00
          Total                            $ 63,016.42

----------
*  Estimated


ITEM 26.     RECENT SALES OF UNREGISTERED SECURITIES.

        We relied upon Section 4(2) of the Securities Act in claiming exemption
from registration of the securities described below due to the knowledge and
experience in financial and business matters of the investors involved, there
was no public offering of such securities, there was no general solicitation or
advertising involved in the offers or sales of the securities and the issuances
otherwise met the requirements for exemption from registration pursuant to
Section 4(2). We have provided below the facts relied upon in order to make the
Section 4(2) exemption available for each transaction.

        On December 7, 2005, we issued to Midsummer and Islandia, in a private
offering, (i) $7,000,000 aggregate principal amount of convertible debentures
due December 7, 2009, convertible into 15,404,930 shares of common stock, with a
conversion price of $0.4544 per share and (ii) five-year warrants to purchase
13,574,399 shares of common stock at an exercise price of $0.4761 per share. We
received $4,500,000 in cash from Midsummer and $2,500,000 in cash from Islandia
in exchange for the debentures and warrants. There were a total of 2 investors
in this transaction (Midsummer and Islandia), and each investor represented and
warranted to us, among other things, the following:

        (i)    that the debentures and warrants were being acquired for its own
               account and not with a view to distribute such debentures and
               warrants;

        (ii)   that such investor is an "accredited investor" as defined in Rule
               501(a)(1), (a)(2), (a)(3), (a)(7) or (a)(8) under the Securities
               act or a "qualified institutional buyer" as defined in Rule
               144A(a) under the Securities Act;

        (iii)  that such investor has such knowledge, sophistication and
               experience in business and financial matters so as to be capable
               of evaluating the merits and risks of such investment; and

        (iv)   that such investor was not purchasing the debentures and warrants
               as a result of any advertisement, article, notice or other
               communication regarding the securities.

        On December 7, 2005, we also issued, in a private offering, a five-year
warrant to purchase 485,213 shares of common stock at an exercise price of
$0.4761 per share to Montgomery in partial consideration for financial advisory
services performed by Montgomery in connection with the foregoing private
offering. Montgomery was the only investor in this transaction, and Montgomery
provided us with similar representations and warranties as those given by
Midsummer and Islandia, described above.

        On December 5, 2005, we issued to CEOcast, in a private offering,
130,000 shares of common stock in partial consideration of investor relations
services provided to Electronic Sensor Technology by CEOcast. CEOcast was the
only investor in this transaction, and CEOcast provided us with similar
representations and warranties as those given by Midsummer and Islandia,
described above.


                                      II-2




        On December 5, 2005, we issued to HomelandSecurityStocks, in a separate
private offering, a five-year warrant to purchase 350,000 shares of common stock
at an exercise price of $2.40 per share in partial settlement of litigation
between Electronic Sensor Technology and HomelandSecurityStocks.
HomelandSecurityStocks was the only investor in this transaction, and
HomelandSecurityStocks provided us with similar representations and warranties
as those given by Midsummer and Islandia, described above.

        On October 7, 2005, we granted to James Frey, Chairman of the Board of
Directors, non-qualified options to purchase 250,000 shares of common stock at
an exercise price of $0.64 per share under our 2005 Stock Incentive Plan. Mr.
Frey's stock options will vest as follows: one quarter of the options will vest
on March 8, 2006, one quarter on September 8, 2006, one quarter on March 8, 2007
and one quarter on September 8, 2007, provided Mr. Frey is still participating
as a member of our Board of Directors at the end of each such six-month period.
Such options were granted to Mr. Frey as compensation for his service as
Chairman of the Board of Directors. Mr. Frey was the only investor in this
transaction, and this transaction qualified for exemption from registration by
virtue of Mr. Frey's position as Chairman of the Board of Electronic Sensor
Technology and Mr. Frey's representation to us that he was acquiring such
securities for his own account and not with a view toward distribution.

        On October 7, 2005, we granted to Matthew Collier, former President and
Chief Executive Officer of Electronic Sensor Technology, non-qualified options
to purchase 500,000 shares of common stock at an exercise price of $0.64 per
share. Mr. Collier's options would have vested, 33% annually (and 34% in the
third year), provided Mr. Collier was still employed by Electronic Sensor
Technology at the end of each such annual period. On January 25, 2006, Mr.
Collier resigned from his position as President and Chief Executive Officer of
Electronic Sensor Technology, and is no longer employed by Electronic Sensor
Technology. Pursuant to the terms of Mr. Collier's employment agreement, upon
Mr. Collier's resignation, the vesting schedule of his options was accelerated
by six months. In addition, pursuant to the terms of the Settlement Agreement,
Mutual Release and Amendment of Option Agreement entered into between Electronic
Sensor Technology and Mr. Collier on January 25, 2006, options to purchase
200,000 shares of common stock at an exercise price of $0.64 per share will vest
in the first vesting period, which, as a result of the six-month acceleration of
the vesting of the options, was deemed to occur on November 26, 2005. In
accordance with the terms of the Option Agreement, Mr. Collier's resignation
will result in the forfeiture of the unvested options to purchase 300,000 shares
of common stock, and Mr. Collier will have three months from January 25, 2006 in
which to exercise the vested options to purchase 200,000 shares of common stock.
Mr. Collier also was granted 75,000 shares of restricted common stock on January
25, 2006, subject to a right of first refusal by Electronic Sensor Technology in
the event Mr. Collier wishes to sell such shares. Such shares and options were
granted to Mr. Collier as compensation for his service as President and Chief
Executive Officer. Mr. Collier was the only investor in these transactions, and
these transactions qualified for exemption from registration by virtue of Mr.
Collier's position as Chairman of the Board of Electronic Sensor Technology and
Mr. Collier's representation to us that he was acquiring such securities for his
own account and not with a view toward distribution.

        On February 1, 2005, in connection with various mergers whereby
Electronic Sensor Technology, Inc. acquired Electronic Sensor Technology, L.P.,
we issued, in a private offering, 3,985,000 shares of common stock and
three-year warrants to purchase 3,985,000 shares of common stock at an exercise
price of $1.00 per share. In exchange for such common stock and warrants, we
received $3,985,000 in cash from investors. There were 38 investors in this
transaction, and each investor provided us with similar representations and
warranties as those given by Midsummer and Islandia, described above.

        On the same date, certain bridge investors of Electronic Sensor
Technology, L.P. exchanged Class C Partnership Interests in Electronic Sensor
Technology, L.P. for 200,000 shares of common stock and warrants to purchase
200,000 shares of common stock at $1.00 per share. There were 7 investors in
this transaction, and each investor provided us with similar representations and
warranties as those given by Midsummer and Islandia, described above.

        On the same date, we issued 20,000,000 shares of common stock to
shareholders of Amerasia Technology, Inc. and L&G Sensor Technology, L.P.,
holders of the partnership interests of Electronic Sensor Technology, L.P. On
the same date, we also issued 2,783,741 shares of common stock and warrants to
purchase 1,391,871 shares of common stock at an exercise price of $1.00 per
share, so long as the trading price of the common stock is at least $1.50 per
share, in exchange for the cancellation of certain debt by Electronic Sensor
Technology, L.P. debtholders.

                                      II-3



On the same date, in connection with the mergers, options to purchase 969,500
limited partnership interests of Electronic Sensor Technology, L.P. were
terminated and replaced by options to purchase 969,500 shares of common stock of
Electronic Sensor Technology, Inc. The replacement options of Electronic Sensor
Technology, Inc. carried over the same exercise prices and vesting provisions as
the options to purchase limited partnership interests of Electronic Sensor
Technology, L.P. There were 20 investors, in the aggregate, in the foregoing 3
related transactions, and each investor provided us with similar representations
and warranties as those given by Midsummer and Islandia, described above.

        On March 1, 2004, Bluestone issued, in a private offering, 260,000
shares of common stock at $0.25 per share. In exchange for such common stock,
Bluestone received $65,000 in cash from investors. We are not aware of the
factual circumstances surrounding Bluestone's reliance on an exemption from
registration of such securities.


ITEM 27.     EXHIBITS.

EXHIBIT
NUMBER       DESCRIPTION
----------   -------------------------------------------------------------------
See Exhibit Index.

ITEM 28.     UNDERTAKINGS.


     (a)     Electronic Sensor Technology hereby undertakes and will:


             (1)     File, during any period in which it offers or sells
     securities, a post-effective amendment to this registration statement to:

             (i)     Include any prospectus required by Section 10(a)(3) of the
     Securities Act;

             (ii)    Reflect in the prospectus any facts or events which,
     individually or together, represent a fundamental change in the
     information in the registration statement. Notwithstanding the
     foregoing, any increase or decrease in volume of securities offered (if
     the total dollar value of securities offered would not exceed that
     which was registered) and any deviation from the low or high end of the
     estimated maximum offering range may be reflected in the form of
     prospectus filed with the Commission pursuant to Rule 424(b) if, in the
     aggregate, the changes in volume and price represent no more than a 20
     percent change in the maximum aggregate offering price set forth in the
     "Calculation of Registration Fee" table in the effective registration
     statement; and

             (iii)   Include any additional or changed material information on
     the plan of distribution.

             (2)     For determining liability under the Securities Act, treat
each post-effective amendment as a new registration statement of the
securities offered, and the offering of the securities at that time to
be the initial bona fide offering.

             (3)     File a post-effective amendment to remove from registration
any of the securities that remain unsold at the end of the offering.

             (4)     For determining liability of the undersigned Company under
the Securities Act to any purchaser in the initial distribution of the
securities, the undersigned Company undertakes that in a primary
offering of securities of the undersigned Company pursuant to this
registration statement, regardless of the underwriting method used to
sell the securities to the purchaser, if the securities are offered or
sold to such purchaser by means of any of the following communications,
the undersigned Company will be a seller to the purchaser and will be
considered to offer or sell such securities to such purchaser:

             (i)     Any preliminary prospectus or prospectus of the undersigned
     Company relating to the offering required to be filed pursuant to Rule
     424 (Section 230.424 of this chapter);

                                      II-4



             (ii)    Any free writing prospectus relating to the offering
     prepared by or on behalf of the undersigned Company or  used or referred to
     by the undersigned Company;

             (iii)   The portion of any other free writing prospectus relating
     to the offering containing material information about the undersigned
     Company or its securities provided by or on behalf of the undersigned
     Company; and

             (iv)     Any other communication that is an offer in the offering
     made by the undersigned Company to the purchaser.

     (b)     Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of Electronic Sensor Technology pursuant to the foregoing provisions, or
otherwise, Electronic Sensor Technology has been advised that in the opinion of
the Securities and Exchange Commission such indemnification is against public
policy as expressed in the Securities Act and is, therefore, unenforceable. In
the event that a claim for indemnification against such liabilities (other than
the payment by Electronic Sensor Technology of expenses incurred or paid by a
director, officer or controlling person of Electronic Sensor Technology in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, Electronic Sensor Technology will, unless in the opinion of its
counsel the matter has been settled by controlling precedent, submit to a court
of appropriate jurisdiction the question whether such indemnification by it is
against public policy as expressed in the Securities Act and will be governed by
the final adjudication of such issue.

                                   *    *    *

                                      II-5




                                   SIGNATURES


        In accordance with the requirements of the Securities Act of 1933, the
registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form SB-2 and authorized this Pre-Effective
Amendment No. 1 to registration statement on Form SB-2 to be signed on its
behalf by the undersigned, in the city of Newbury Park, state of California on
February 15, 2006.

                                     ELECTRONIC SENSOR TECHNOLOGY, INC.


                                     By:      /s/  Teong Lim
                                         ---------------------------------------
                                         Teong Lim
                                         President and Chief Executive Officer
                                         (Principal Executive Officer)

        In accordance with the requirements of the Securities Act of 1933, this
Pre-Effective Amendment No. 1 to registration statement on Form SB-2 has been
signed by the following persons in the capacities and on the dates stated.


                                 By: /s/  Teong Lim
                                     -------------------------------------------
                                         Teong Lim
                                         President and Chief Executive Officer
                                         (Principal Executive Officer)


                                 By: /s/  Francis Chang
                                     -------------------------------------------
                                     Francis Chang
                                     Secretary and Vice President of Finance and
                                     Administration
                                     (Principal Financial Officer and Principal
                                     Accounting Officer)


        Pursuant to the requirements of the Securities Act of 1933, this
Pre-Effective Amendment No. 1 to registration statement on Form SB-2 has been
signed below by the following persons in the capacities and on the dates
indicated.

Date: February 15, 2006          By: *
                                     -------------------------
                                     James Frey, Chairman

Date: February 15, 2006          By: *
                                     -------------------------
                                     Francis Chang, Director

Date: February 15, 2006          By: *
                                     -------------------------
                                     Teong Lim, Director

Date: February 15, 2006          By: /s/ Edward Staples
                                     -------------------------
                                     Edward Staples, Director

                                 By:
                                     -------------------------
                                     Mike Krishnan, Director

Date: February 15, 2006          By: *
                                     -------------------------
                                     James Wilburn, Director


*By:/s/  Francis Chang
    --------------------------------
    Francis Chang
    Attorney-in-Fact


                                      II-6




                               EXHIBIT INDEX

EXHIBIT
NUMBER    DESCRIPTION
-------    ---------------------------------------------------------------------

3.1       Articles of Incorporation of Electronic Sensor Technology,
          as amended.*

4.1       Description of our common stock in Article Fourth of the
          Amendment to Electronic Sensor Technology's Articles of
          Incorporation dated January 25, 2005 (incorporated by
          reference from Exhibit 3.1 hereto).

4.2       Description of rights of shareholders of Electronic Sensor Technology
          in Article I and Article VI of Electronic Sensor Technology's Bylaws
          (incorporated by reference from Exhibit 3.2 of the amended
          registration statement on Form SB-2 filed on June 16, 2003).

5.1       Opinion of [______________] regarding validity of the common
          stock.+

10.1      Term Sheet dated December 2, 2004 between Bluestone Ventures Inc. and
          Electronic Sensor Technology, L.P.(incorporated by reference from
          Exhibit 10.1 of the current report on Form 8-K filed on
          January 10, 2005).

10.2      Agreement and Plan of Merger dated as of January 31, 2005, by and
          among Bluestone Ventures Inc., Amerasia Technology, Inc., L&G Sensor
          Technology, Inc., Amerasia Acquisition Corp. and L&G Acquisition Corp.
          (incorporated by reference from Exhibit 10.1 of the current report on
          Form 8-K filed on February 7, 2005).

10.3      Form of Subscription Agreement between Bluestone Ventures Inc. and
          each investor on the signature page thereto (incorporated by reference
          from Exhibit 10.2 of the current report on Form 8-K filed on
          February 7, 2005).

10.4      Electronic Sensor Technology, Inc. 2005 Stock Incentive Plan
          (incorporated by reference from Exhibit 10.1 of the annual report on
          Form 10-KSB filed on April 15, 2005).

10.5      Form of Stock Option Agreement (incorporated by reference from Exhibit
          10.2 of the annual report on Form 10-KSB filed on April 15, 2005).

10.6      Business Loan Agreement dated March 11, 2005, between Electronic
          Sensor Technology, Inc. and East West Bank (incorporated by reference
          from Exhibit 10.4 of the annual report on Form 10-KSB filed on
          April 15, 2005).

10.7      Commercial Security Agreement dated March 11, 2005, between
          Electronic Sensor Technology, Inc. and East West Bank (incorporated by
          reference from Exhibit 10.5 of the annual report on Form 10-KSB filed
          on April 15, 2005).

10.8      Letter agreement dated as of May 16, 2005, by and between Electronic
          Sensor Technology, Inc. and Matthew Collier (incorporated by reference
          from Exhibit 10.1 of the current report on Form 8-K/A filed on
          October 6, 2005).

10.9      Letter agreement dated as of October 3, 2005, between Electronic
          Sensor Technology, Inc. and James Frey (incorporated by reference from
          Exhibit 10.1 of the current report on Form 8-K filed on
          October 7, 2005).

10.10     Letter agreement dated as of February 21, 2005, between Electronic
          Sensor Technology, Inc. and James Frey (incorporated by reference
          from Exhibit 10.2 of the current report on Form 8-K filed on
          October 7, 2005).


                                  II-7




10.11     Addendum dated as of April 1, 2005 to the letter agreement dated
          February 21, 2005, between Electronic Sensor Technology, Inc. and
          James Frey (incorporated by reference from Exhibit 10.3 of the current
          report on Form 8-K filed on October 7, 2005).

10.12     International Distributorship Agreement dated August 2005, between
          Electronic Sensor Technology Inc. and Beijing R&D Technology Co., Ltd.

10.13     International Distributorship Agreement dated October 21, 2005,
          between Electronic Sensor Technology Inc. and TechMondial, Ltd.

10.14     Form of Securities Purchase Agreement dated as of December 7, 2005,
          among Electronic Sensor Technology, Inc., Midsummer Investment, Ltd.
          and Islandia, L.P. (incorporated by reference from Exhibit 10.1 of the
          current report on Form 8-K filed on December 8, 2005).

10.15     Form of Registration Rights Agreement dated as of December 7, 2005,
          among Electronic Sensor Technology, Inc., Midsummer Investment, Ltd.
          and Islandia, L.P. (incorporated by reference from Exhibit 10.2 of the
          current report on Form 8-K filed on December 8, 2005).

10.16     Settlement Agreement, Mutual Release and Amendment of Option
          Agreement, effective as of January 25, 2006, between Electronic Sensor
          Technology, Inc. and Matthew S. Collier (incorporated by reference
          from Exhibit 10.1 of the current report on Form 8-K filed on
          January 31, 2006).


16.1      Letter from Manning Elliott Chartered Accountants (incorporated by
          reference from Exhibit 16.1 of the current report on Form 8-K filed on
          April 19, 2005).


21.1      Subsidiaries of Electronic Sensor Technology.*


23.1      Consent of Sherb & Co., LLP, Certified Public Accountants.


23.3      Consent of [__________________]+

24.1      Power of Attorney.*

----------
*  Previously filed.
+  To be filed.



                                      II-8