RAE Systems to Highlight Life Critical Information Tools for First Responders at FDIC

Sensing and analysis tools enable first responders to assess and act on unseen threats

SUNNYVALE, Calif. April 4, 2005 RAE Systems Inc. (AMEX: RAE), a leading global developer and manufacturer of rapidly-deployable, multi-sensor chemical and radiation detection monitors and networks for homeland security and industrial applications, today announced that it will be presenting the companys latest situational awareness tools at the Fire Department Instructors Conference in Indianapolis, Indiana on April 14-16.

Firefighters are often called on to respond to complex, chaotic events that may or may not involve fires, said Bob Durstenfeld, director of corporate marketing for RAE Systems. These environments may contain potentially toxic substances such as radiation and lethal gases, which means that the threats first responders face are often unseen. RAE Systems sensing and information tools enable better deployment decisions and help front line personnel avoid exposure to toxic substances, ensuring that they not only get home at night but that they also are able to enjoy their retirements.

Over the past year, RAE Systems has focused on developing sensing, data analysis and decision support tools that enable the best possible assessment and decision making at the site of terrorist events and HazMat accidents. RAE Systems will be demonstrating products including PlumeRAE, HazRAE, AreaRAE, and GammaRAE II.

PlumeRAE is RAE Systems solution for maximizing community safety by providing the decision support information needed by civil authorities to protect nearby populations after the release of toxic materials. PlumeRAE enables first responders to measure the direction and concentration of a plume, giving incident commanders the information they need to prioritize response actions given limited resources, to direct shelter-in-place plans, and to issue road closures. Decision making is even more powerful when the PlumeRAE is coupled with HazRAE, the companys hazardous materials decision support application that runs on handheld, wireless devices. HazRAE contains more than 91,000 chemical, biological warfare, bioterror agents, trade names and improvised explosive devices. Materials can be retrieved by traditional search identifiers such as name or UN number, and can also be retrieved by using observable physical characteristics and symptoms in victims.

To see a demonstration of these products at FDIC, please visit RAE Systems booth #2327 at the Indiana Convention Center.

About RAE Systems
RAE Systems is a leading global developer and manufacturer of rapidly deployable, multi-sensor chemical detection monitors and networks for homeland security and industrial applications. In addition, RAE Systems offers a full line of portable single-sensor chemical and radiation detection products. RAE Systems products enable the military and first responders such as firefighters, law enforcement and other emergency management personnel to detect and provide early warning of weapons of mass destruction and other hazardous materials. Industrial applications include the detection of toxic industrial chemicals, volatile organic compounds and petrochemicals. RAE Systems products are used by many U.S. government agencies, including the Department of Homeland Security, the Department of Justice, and the Department of State, as well as all branches of the U.S. military, and by numerous city and state agencies. Our end users also include many of the worlds leading corporations in the airline, automotive, computer and oil industries. Our products are used in civilian and government atmospheric monitoring programs in over 50 countries. For more information about RAE Systems, please visit www.RAESystems.com

Safe Harbor Statement
This press release contains “forward-looking” statements, as that term is used in Section 21E of the Securities Exchange Act of 1934. Forward-looking statements are denoted by such words as expected to increase. These types of statements address matters that are subject to risks and uncertainties, which could cause actual results to differ materially. Factors that could cause or contribute to such differences include, but are not limited to, the general economic and industry factors and receptiveness of the market to RAE and its products. In addition, our forward-looking statements should be considered in the context of other risk factors discussed in our filings with the Securities and Exchange Commission, including but not limited to our annual report on Form 10-K and Form 10-Q filings, available online at http://www.sec.gov. All forward-looking statements are based on information available to the company on the date hereof, and the company assumes no obligation to update such statements.