EST Announces Election of Directors and Chairman

Monday, May 5, 8:30 am ET

NEWBURY PARK, Calif.--(BUSINESS WIRE)--Electronic Sensor Technology (EST)
(OTCBB:ESNR - News), a leading provider of innovative homeland security and
environmental solutions, announced today that it has elected Mr. William
Wittmeyer and Ms. Maggie Tham to its Board of Directors. In addition, Dr. Teong
Lim, Founder and Director, has been elected Chairman of the Board. Mr. Wittmeyer
and Ms. Tham replace Mr. James Frey and Mr. Francis Chang, who have retired from
the Board.

Mr. Wittmeyer has over 20 years experience in high-technology business and
investment management. In 2003, he and Ms. Tham founded eXS Inc., a wireless
access company, developing innovative and cost effective solutions for
developing economics. Prior to founding these companies, Mr. Wittmeyer was a
partner in a venture capital firm, investing in telecommunications and
semiconductor start-ups. He was an early investor in Network Equipment
Technologies Inc., UTSarcom, Zoran and IXYS. He has a B.Sc. (E.E.) from the
Coast Guard Academy and an M.B.A. from Columbia University Graduate School of
Business Administration.

Ms. Tham has over 20 years experience in management and strategy consulting. In
2003, she together with Mr. Wittmeyer founded eXS Inc., a wireless access
company, developing innovative and cost effective solutions, focusing on the
mass market in high growth emerging economies. Ms. Tham was a principal of
Wittham, a boutique investment banking firm, specializing in Trans Pacific
investments. She raised early stage financing for UTStarcom and other companies.
Before this, Ms. Tham worked as a strategy and business consultant in New York
City and in Asia. Ms. Tham is an Economics Graduate of London School of
Economics (B.Sc. Econs, Upper Division) and has a M.B.A. degree from the
Columbia University Graduate School of Business Administration.

"We regret the departure of Jim and Francis", said Dr. Teong Lim, Chairman,
"Both of them were instrumental in setting the direction of the company when it
became public in 2005. They have my respect and gratitude for their
contributions." Dr. Lim continued, "Mr. Wittmeyer's and Ms. Tham's experience in
high-technology, startups, and finance, will be of significant value to EST's
future."

About Electronic Sensor Technology:

Electronic Sensor Technology develops, manufactures, sells, and supports a
product line of patented chemical vapor analyzers. The ultra high-speed gas
chromatography coupled with a solid-state detector enables analysis of nearly
any odor, fragrance, or chemical vapor within ten seconds. We believe that the
company's product line is strategically positioned to address key needs of the
homeland security market, environmental and quality assurance applications, and
product quality of food and beverage.

SEC Filings and Forward Looking Statements

Certain statements in this release, including those relating to revenue
expectations; the company's plans regarding business and product development;
product sales and distribution; the sufficiency of the company's resources to
satisfy operation cash requirements; and future capital investment by
prospective investors are forward-looking statements within the meaning of
Section 27A of the Securities Act of 1933, as amended, and Section 21E of the
Securities Exchange Act of 1934, as amended. These forward-looking statements
may contain the words "believe," "anticipate," "expect," "predict," "hopeful,"
"estimate," "project," "will be," "will continue," "will likely result," or
other similar words and phrases. Risks and uncertainties exist that may cause
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results to differ materially from those set forth in these forward-looking
statements. Factors that could cause the anticipated results to differ from
those described in the forward-looking statements include, among others, failure
to come to terms with prospective investors, risks related to changes in
technology, our dependence on key personnel, our ability to protect our
intellectual property rights, emergence of future competitors, changes in our
largest customer's business and government regulation of homeland security
companies. 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 that the forward-looking
statements are made.

Contact:

Electronic Sensor Technology

Frank Zuhde (805) 480-1994 X135

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