Electronic Sensor Technology, Inc - Prospectus filed pursuant to Rule 424(b)(3) (424B3)

PROSPECTUS SUPPLEMENT Filed Pursuant to Rules 424(b)(3) and 424(c)
(to prospectus dated Registration No. 333-138977
November 9, 2007)
[GRAPHIC OMITTED] Electronic Sensor Technology

ELECTRONIC SENSOR TECHNOLOGY, INC.
19,906,669 SHARES OF COMMON STOCK

This document supplements the prospectus dated November 9, 2007 and the prospectus supplement dated December 28, 2007 relating to the registration of our common stock under our Registration Statement on Form SB-2 (Registration No. 333-138977). This prospectus supplement is incorporated by reference into the prospectus.

This prospectus supplement modifies and supersedes the first sentence under the heading "Description of Securities" in the prospectus dated November 9, 2007 to replace "56,756,098" with "59,033,632".

This prospectus supplement also modifies the information set forth under the heading Directors, Executive Officers and Control Persons" in the prospectus dated November 9, 2007 to delete the following paragraph:

"MICHEL A. AMSALEM

Michel A. Amsalem, age 59, currently serves as a director of Electronic Sensor Technology. Mr. Amsalem has served as a director of Electronic Sensor Technology since September 7, 2006. Mr. Amsalem is the founder and, since July 2001, President of Midsummer Capital, the investment manager of the Midsummer Group of Funds, as well as a director of Midsummer Investment Ltd. Prior to his involvement with hedge funds and the creation of Midsummer Capital, Mr. Amsalem, from May 1999 through June 2001, was a Principal and Managing Partner of Omicron Capital, an investment advisor to a group of funds with a strategy similar to that of Midsummer. Mr. Amsalem was also founder and head of the Structured Finance Department of Citibank, and of similar activities for Banque Indosuez' Investment Bank for Latin America and Eastern Europe and Patricof & Co. Mr. Amsalem holds a Doctoral degree in Business Administration from Harvard University, an MBA from Columbia University and is a graduate of Ecole des Hautes Etudes Commerciales in France. He is a professor of Business and Investment Strategy at Columbia University Graduate School of Business. Mr. Amsalem currently serves as a director of Hartville Group, Inc., which is a publicly reporting company."

The remainder of the information in this prospectus supplement replaces and supersedes the information set forth under the headings "Selling Security Holders" and "Security Ownership of Certain Beneficial Owners and Management" in the prospectus dated November 9, 2007.

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 January 16, 2008

SELLING SECURITY HOLDERS

Each of the selling security holders obtained beneficial ownership of the common stock being registered for resale pursuant to this registration statement in one of the following transactions, as set forth below.

o In a private offering on December 7, 2005, we issued to Islandia, L.P. and Midsummer Investment Ltd. an aggregate principal amount of $7,000,000 of 8% unsecured convertible debentures due December 7, 2009 that were convertible into 15,404,930 shares of our common stock. At issuance, the debentures were convertible into common stock at a conversion 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. Such conversion price was subsequently reduced to $0.4000, pursuant to the Forbearance and Amendment Agreement entered into among Electronic Sensor Technology, Midsummer and Islandia on September 7, 2006, which consequently increased the shares of common stock issuable upon conversion of the debentures to 17,500,000. 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 20% of such shares, or 4,137,260 shares, to facilitate secondary trading by the holders of the debentures.

o In a private offering on December 7, 2005, we issued to Islandia and Midsummer five-year warrants to purchase 12,130,314 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 warrants. Such exercise price was subsequently reduced to $0.4300, pursuant to the Forbearance and Amendment Agreement entered into among Electronic Sensor Technology, Midsummer and Islandia on September 7, 2006. In connection with the private offering, we agreed to register 130% of the common stock underlying the warrants, totaling 15,769,409 shares, which we are registering on this registration statement to facilitate secondary trading by the holders of the debentures.

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 7, 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;

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o the percentage of common stock to be beneficially owned by each selling security holder after completion of the offering, based upon the number of shares of common stock to be beneficially owned by such selling security holder (taking into account the assumptions set forth above), divided by 59,033,632, which represents the total number of shares of common stock issued and outstanding as of the date of this prospectus, plus, for such selling security holder, the number of shares of common stock to be beneficially owned by such selling security holder; 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.

To our knowledge, none of the selling security holders is a broker-dealer or an affiliate of a broker-dealer.

 Number of Shares
 Shares of of common stock Shares of common stock Benefically
 common stock to be offered Owned After Completion of the
 Beneficially for the Selling Offering
 Owned Prior Security -----------------------------------
Name of Selling Security Holder to the Offering Holder's Account Number Percentage
------------------------------- ---------------- ---------------- ---------------- ----------------
Islandia, L.P. (1) 12,317,929 7,109,525 5,208,404 8.11
Midsummer Investment Ltd. (2) 22,172,272 12,797,144 9,366,128 13.69

(1) Islandia, L.P.'s shares include 20% of 6,250,000 shares of common stock underlying a debenture convertible within 60 days of the date of this prospectus and shares of common stock that may be used to pay interest on such debenture and 130% of 4,332,255 shares of common stock underlying a warrant exercisable within 60 days of the date of this prospectus. The general partner of Islandia is John Lang, Inc., a New York Sub-S corporation formed to manage investments. John Lang, Inc. has sole dispositive power and sole voting power over all matters not related to director elections. The individuals that exercise shared dispositive and voting power for John Lang, Inc. are Richard Berner, President of John Lang, Inc. and Edgar Berner and Thomas Berner, both Vice-Presidents of John Lang, Inc. By virtue of these relationships John Lang, Inc., Richard Berner, Edgar Berner and Thomas Berner may be deemed to have indirect beneficial ownership of the shares of common stock beneficially owned by Islandia; however, John Lang, Inc. Richard Berner, Edgar Berner and Thomas Berner disclaim beneficial ownership of the shares of common stock beneficially owned by Islandia.

(2) Midsummer Investment Ltd.'s shares include 20% of 11,250,000 shares of common stock underlying a debenture convertible within 60 days of the date of this prospectus and shares of common stock that may be used to pay interest on such debenture and 130% of 7,798,059 shares of common stock underlying a warrant exercisable within 60 days of the date of this prospectus. 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.

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SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

The following table sets forth information, as of the date of this prospectus, 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 shareholder known by Electronic Sensor Technology to be the beneficial owner of more than 5% of the outstanding common stock. The information regarding beneficial owners of 5% or more of our common stock was gathered by us from the filings made by such owners with the SEC or from other sources. Shares that may be acquired within 60 days are treated as outstanding for purposes of determining the amount and percentage beneficially owned.

 Amount and Nature of
 Name and Address (1) Beneficial Ownership Percentage
Title of Class of Beneficial Owner (Shares of Stock) of Class (2)
-------------- ----------------------------------- -------------------- ------------
Common stock Barry Howe+* 100,000(3) 0.17%
Common stock Philip Yee+ 36,250(4) 0.06%
Common stock Gary Watson+ 287,500(5) 0.49%
Common stock James Frey* 450,000(6) 0.76%
Common stock Teong Lim*++ 5,312,908(7) 8.91%
Common stock Francis Chang*++ 4,023,160(8) 6.77%
Common stock Rita Benoy Bushon* 0(9) 0.00%
Common stock James Wilburn* 150,000(10) 0.25%
Common stock Lewis Larson* 100,000(11) 0.17%
Common stock Land & General Berhad++ 9,948,801(12) 16.76%
Common stock L&G Resources (1994), Inc.++ 9,948,801(12) 16.76%
Common stock 3 Springs, LLC++ 3,853,160 6.53%
Common stock TC Lim, LLC++ 5,167,908 8.75%
Common stock Midsummer Investment Ltd.++ 22,172,272(13) 28.40%
Common stock Islandia L.P.++ 12,317,929(14) 17.69%
Common stock All directors and named executive
 officers as a group 10,559,818(15) 17.26%

* Director

+ Named executive officer

++5% or more beneficial owner

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(1) The address of each director, named executive officer, 3 Springs, LLC and TC Lim, LLC is c/o Electronic Sensor Technology, Inc., 1077 Business Center Circle, Newbury Park, California 91320. The address of Midsummer Investment Ltd. is 295 Madison Avenue, 38th Floor, New York, New York 10017. The address of Islandia L.P. is 485 Madison Avenue, 23rd Floor, New York, New York 10022. The address of each of L&G Resources (1994), Inc. and Land & General Berhad is 7 Persiaran Dagang, Bandar Sri Damansara, Kuala Lumpur, Malaysia 52200.

(2) These percentages are calculated based upon the total amount of outstanding shares of common stock beneficially owned by each person or group, including shares of common stock that person or group has the right to acquire within 60 days pursuant to options, warrants, conversion privileges or other rights, divided by 59,033,632, which represents the total number of shares of common stock issued and outstanding as of the date of this prospectus, plus, for each person or group, any shares of common stock that person or group has the right to acquire within 60 days pursuant to options, warrants, conversion privileges or other rights.

(3) Includes 100,000 shares of common stock underlying an option exercisable within 60 days of the date of this prospectus.

(4) Includes 36,250 shares of common stock underlying an option exercisable within 60 days of the date of this prospectus.

(5) Includes 287,500 shares of common stock underlying options exercisable within 60 days of the date of this prospectus.

(6) Includes 450,000 shares of common stock underlying options exercisable within 60 days of the date of this prospectus.

(7) Includes 145,000 shares of common stock underlying options exercisable within 60 days of the date of this prospectus, and 438,796 shares of common stock underlying warrants exercisable within 60 days of the date of this prospectus 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, LLC.

(8) Includes 170,000 shares of common stock underlying options exercisable within 60 days of the date of this prospectus, and 257,247 shares of common stock underlying warrants exercisable within 60 days of the date of this prospectus 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, LLC.

(9) Ms. Bushon is the Executive Director of Land & General Berhad and President of L&G Resources (1994), Inc., a wholly owned subsidiary of Land & General Berhad. By virtue of her position, Ms. Bushon may be deemed to share dispositive power over the 9,948,801 shares of common stock beneficially owned by Land & General Berhad and L&G Resources (1994), Inc. Ms. Bushon is one of six directors on the Board of Directors of Land & General Berhad and the Board of Directors of Land & General Berhad makes the ultimate voting and investment decisions with respect to the 9,948,801 shares of common stock. Ms. Bushon disclaims beneficial ownership of such shares of common stock.

(10) Includes 150,000 shares of common stock underlying an option exercisable within 60 days of the date of this prospectus.

(11) Includes 100,000 shares of common stock underlying an option exercisable within 60 days of the date of this prospectus.

(12) Includes 9,632,534 shares of common stock and 316,267 shares of common stock underlying a warrant exercisable within 60 days of the date of this prospectus held by L&G Resources (1994), Inc., a wholly-owned subsidiary of Land & General Berhad, of which Land & General Berhad is a beneficial owner. Rita Benoy Bushon is President of L&G Resources (1994), Inc. and Executive Director of Land & General Berhad. By reason of such relationships, Ms. Bushon may be deemed to share dispositive power over the shares of common stock beneficially owned by L&G Resources (1994), Inc. Ms. Bushon expressly disclaims beneficial ownership as Ms. Bushon is one

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of six directors on the Board of Directors of Land & General Berhad and the Board of Directors of Land & General Berhad makes the ultimate voting and investment decisions with respect to the 9,948,801 shares of common stock.

(13) Includes 11,250,000 shares of common stock underlying a debenture convertible within 60 days of the date of this prospectus, 7,798,059 shares of common stock underlying a warrant exercisable within 60 days of the date of this prospectus and 3,124,213 shares of common stock issued as interest on the debenture. The conversion of the debenture and exercise of the warrant is contractually capped such that such conversion or exercise, as applicable, shall not cause Midsummer's beneficial ownership to exceed 4.99%, unless waived by Midsummer, and in no event to exceed 9.99% (without giving effect to shares of common stock underlying any unconverted portion of the debenture or unexercised portion of the warrant). 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.

(14) Includes 6,250,000 shares of common stock underlying a debenture convertible within 60 days of the date of this prospectus, 4,332,255 shares of common stock underlying a warrant exercisable within 60 days of the date of this prospectus and 1,735,674 shares of common stock issued as interest on the debenture. The conversion of the debenture and exercise of the warrant is contractually capped such that such conversion or exercise, as applicable, shall not cause Islandia's beneficial ownership to exceed 4.99%, unless waived by Islandia, and in no event to exceed 9.99% (without giving effect to shares of common stock underlying any unconverted portion of the debenture or unexercised portion of the warrant). The general partner of Islandia is John Lang, Inc., a New York Sub-S corporation formed to manage investments. John Lang, Inc. has sole dispositive power and sole voting power over all matters not related to director elections. The individuals that exercise shared dispositive and voting power for John Lang, Inc. are Richard Berner, President of John Lang, Inc. and Edgar Berner and Thomas Berner, both Vice-Presidents of John Lang, Inc. By virtue of these relationships John Lang, Inc., Richard Berner, Edgar Berner and Thomas Berner may be deemed to have indirect beneficial ownership of the shares of common stock beneficially owned by Islandia; however, John Lang, Inc. Richard Berner, Edgar Berner and Thomas Berner disclaim beneficial ownership of the shares of common stock beneficially owned by Islandia.

(15) Includes 1,438,750 shares of common stock underlying options exercisable within 60 days of the date of this prospectus and 696,043 shares of common stock underlying warrants exercisable within 60 days of the date of this prospectus, as well as 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.

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