Electronic Sensor Technology Inc. Announces Resignation and Appointment of Chief Financial Officer

   Electronic Sensor Technology Inc. (PINKSHEETS: ESNR), a leading provider of ultra-fast vapor analyzers, announced today that Mr. Steve Wang has been elected at Chief Financial Officer replacing Mr. Phil Yee, who resigned on 21 February 2012.

Mr. Wang is an experienced financial officer. He joins EST after being the CFO of China Health Care Acquisition Corporation, an AMEX listed company, and CFO of Ancogen, a development stage biotech company.

"We welcome Steve's joining EST at this time. Our business is more focused on expanding on the successes we have had in China. Steve's experience in negotiating business alliances, his fluency in Chinese and his contacts in China will be a great asset as we expand our presence in the country," said Dr. Peong Lim.

The zNOSE is a very versatile, ultra-fast Gas Chromatography instrument (GC). More than 600 instruments have been sold around the world. The instrument is used wherever real time analysis of volatile organic compounds and vapors is required. These include detection of contamination of drinking water supplies, detection of explosives, narcotic contraband and food adulteration. It is used in medical research to detect trace amounts of volatile organic compounds found in human breath that are associated with lung cancer and other diseases. For more information, please visit our website at http://www.estcal.com.

About Electronic Sensor Technology: Founded in 1995, Electronic Sensor Technology has developed and patented a chemical vapor analysis process. EST's product provides near real time analysis of gasses detecting volatile organic compounds in amounts as low as one part per trillion. EST's product has been shown to detect salmonella and e-coli contamination of food sources; chemical warfare agents such as Sarin and Agent Orange and Chemical pollutants in the environment.

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.

Contact: Electronic Sensor Technology William Wittmeyer 805-480-1994 ext 105 805-214-1860 direct 650-714-0823 cell http://www.estcal.com