Electronic Sensor Technology Inc (ESNR)

[KauaiPI]

RandyKsd~recent amended PROSPECTUS 424B3 filed on 12/28/2007 seems to indicate the OS will be growing considerably?

I don't see EST as a pump and dump stock like so many of the companies you see out there. In fact...if memory serves...the outstanding shares has stayed about the same for the last year. That's a good sign

...

On the other hand, if you think about it...if the company does announce some big news, we could easily break out with the momentum players jumping on board...and easily churn through 5-10 million shares in a day or two

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PROSPECTUS SUPPLEMENT Filed Pursuant to Rules 424(b)(3)
(to prospectus dated November 9, 2007) and 424(c)
Registration No. 333-130900

[GRAPHIC OMITTED] ELECTRONIC SENSOR TECHNOLOGY

ELECTRONIC SENSOR TECHNOLOGY, INC.
27,538,695 SHARES OF COMMON STOCK

This document supplements the prospectus dated November 9, 2007 relating to
the registration of our common stock under our Registration Statement on
Form SB-2 (Registration No. 333-130900). This prospectus supplement is
incorporated by reference into the prospectus.

This prospectus supplement modifies and supersedes any reference to January
1, 2008 in the prospectus dated November 9, 2007 to replace "January 1, 2008"
with "April 1, 2008".

The remainder of the information in this prospectus supplement modifies the
information set forth under the headings "Selling Security Holders" and "Certain
Relationship and Related Transactions" 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 December 28, 2007


Under the heading "Selling Security Holders", this prospectus adds the
following sentence immediately after the first sentence of the fourth paragraph:

"At issuance, the initial principal payment date of the debentures was
January 1, 2008. The initial principal payment date was extended to April 1,
2008, pursuant to the First Amendment Agreement entered into among Electronic
Sensor Technology, Midsummer and Islandia on December 27, 2007."

Under the heading "Certain Relationships and Related Transactions", this
prospectus adds the following text immediately preceding the text "Forbearance
and Amendment Agreement with Midsummer Investment, Ltd. and Islandia, L.P.":

"First Amendment Agreement with Midsummer Investment, Ltd. and Islandia, L.P.

On December 27, 2007, Electronic Sensor Technology entered into a First
Amendment Agreement with Midsummer and Islandia, which provides for certain
amendments to the debentures issued to Midsummer and Islandia on December 7,
2005 and under the related securities purchase agreement, registration rights
agreement and forbearance and amendment agreement, more fully described below.
Pursuant to the First Amendment Agreement, Midsummer and Islandia agreed to
extend the initial principal payment date of the convertible debentures from
January 1, 2008 to April 1, 2008."