FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public
Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Tham Maggie 		2. Issuer Name and Ticker or Trading Symbol

Electronic Sensor Technology, Inc [ ESNR ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      _____ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

1077 BUSINESS CENTER CIRCLE 		3. Date of Earliest Transaction (MM/DD/YYYY)

7/25/2008
(Street)

NEWBURY PARK, CA 91320
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

10/21/2008 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (right to buy)   $.03   7/25/2008     A     500000   (2)        (1) 7/25/2018   Common Stock   500000   $0   500000   D    

Explanation of Responses:
( 1)  The options granted to Ms. Tham will vest as follows: 25% of the option shares will vest on July 25, 2009, 25% of the option shares will vest on July 25, 2010, 25% of the option shares will vest on July 25, 2011 and 25% of the option shares will vest on July 25, 2012.
( 2)  This amendment is being filed to correct the number of option shares granted to Ms. Tham.

Remarks:
Exhibit 24 - Power of Attorney (incorporated by reference from Form 3 filed on October 21, 2008)

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Tham Maggie
1077 BUSINESS CENTER CIRCLE
NEWBURY PARK, CA 91320 		X



Signatures
/s/ Philip Yee, Attorney-in-Fact for Maggie Tham 1/2/2009
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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