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  5. Macedonia Purchases Six zNose® Model 4500 Portable Instruments

NEWBURY PARK, Calif.–(BUSINESS WIRE)-March 20, 2007–Electronic Sensor Technology Inc. a leading provider of ultra-fast vapor analyzers, announced today that it had received an order for six instruments from the Government of Macedonia. Electronic Sensor Technology zNose® model 4500 was selected over the competition in an open tender. This purchase was part of an ongoing program by the government of Macedonia to strengthen customs enforcement and border security.

The zNose® is a very versatile, ultra-fast Gas Chromatograph (GC). It is used to detect a variety of explosives including: TNT, RTX, C4 and TATP and nerve agents such as Sarin and Mustard Gas. The zNose® is flexible and easy to use a change of software enables it to detect illegal drugs including cocaine, heroin, morphine and ecstasy. Similarly the same instrument can detect the adulteration of food products such as milk contaminated by melamine. The zNose® is currently being used for environmental, food/beverage, petro-chemical, life science and Homeland Security applications. For more information, please visit our website at www.estcal.com

About Electronic Sensor Technology:
Founded in 1995, Electronic Sensor Technology has developed and patented a chemical vapor analysis process. We believe that the Company’s product line is positioned to eliminate key vulnerabilities in the homeland security market, specifically in maritime port, airport, and border security applications.

SEC Filings and Forward-Looking Statements
This press release includes forward looking statements, including the Company’s expectations regarding its ability to develop and access capital markets and its ability to achieve expected results in the chemical detection and analysis industry. The forward looking statements are identified through use of the words “potential,” “anticipate,” “expect,” “planned” and other words of similar meaning. These forward-looking statements may be affected by the risks and uncertainties inherent in the chemical detection and analysis industry and in the Company’s business. The Company cautions readers that certain important factors may have affected and could in the future affect the Company’s beliefs and expectations and could cause the actual results to differ materially from those expressed in any forward-looking statement made by or on behalf of the Company.


Electronic Sensor Technology

William Wittmeyer

805-480-1994 ext

103 650 714 0823 cell

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