To: Savant  who wrote (3 ) 5/21/2007 12:36:25 PM From: Savant     Respond to    of 24  Technology's zNose(R) for Investigation and Inspection of Environmental Contamination Hunan Province of China Has Exclusively Selected Electronic Sensor Technology's zNose(R) for Investigation and Inspection of Environmental Contamination NEWBURY PARK, Calif., May 21, 2007 (BUSINESS WIRE) -- Electronic Sensor Technology (EST) (OTCBB:ESNR - News), has been selected by the Hunan Provincial Environmental Protection Agency (Hunan EPA), one of the 26 provincial level EPAs of China, as the supplier of the emergency water contamination detection and monitoring equipment for their First Responder through EST's distributor in China, Beijing R&D Technology, Co. Ltd. This initial order of ten (10) units of zNose(R) is the largest single order EST has ever received from China so far. "We are very pleased with this latest order and I believe that it is indicative of the superiority of EST's zNose(R) in providing fast and accurate response, high sensitivity and a wide spectrum of chemical compound detections," said Dr. Teong Lim, President and CEO of EST. "We expect other provinces of The Peoples Republic of China to follow Hunan Province to procure similar equipment for their First Responder efforts since our equipment has been proven effective and is approved and recognized by the state environment protection authorities," Dr. Lim added. More information on the use of the zNose(R) for environmental application such as odor detection and analysis can be obtained by clicking the following link: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. For a discussion of these factors, please refer to our recent filings with the Securities and Exchange Commission, including our most recent report on Form 10-KSB. The Company undertakes no obligation to update forward-looking statements to reflect events or circumstances after the date hereof. SOURCE: Electronic Sensor Technology Electronic Sensor Technology Frank Zuhde, 805-480-1994, ext. 135 Copyright Business Wire 2007