RAE Systems to Present Leading Gas Detection Solutions for Industrial Hygienists at AIHce

Company to showcase auto calibration system for PID and multi-gas instruments

SUNNYVALE, Calif. May 9, 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 leading gas detection and industrial hygiene monitoring solutions at booth 629 at the American Industrial Hygienists Conference and Exposition (AIHce) in Anaheim, California on May 23-25, 2005.

Industrial hygienists strive to keep workers, their families, and the community healthy and safe. They have a critical role in making sure that federal, state, and local laws and regulations are followed in the work environment, said Bob Durstenfeld, director of corporate marketing for RAE Systems. One of the biggest challenges in the field is the effective, accurate calibration of sensing and monitoring tools. The AutoRAE calibration system offers an easy mix-and-match approach for a variety of RAE Systems instruments, which increases the proper use of the equipment and improves worker safety.

RAE Systems will highlight the AutoRAE, an integrated charging, bump testing and calibration system for applications requiring detection of volatile organic compound exposure, hydrogen sulfide, carbon monoxide, lower explosive limit, and breathable oxygen level. The AutoRAE is highly portable, snaps together in minutes and operates at the push of a button. The system consists of one controller and up to 10 instrument cradles from any mix of the products supported below. It is easy to add cradles when the job demands it, and it is easy to add controllers, expanding one system into several systems. AutoRAE supports the EntryRAE, RAE Systems’ popular new 4-gas plus PID confined space entry toxic gas monitor. AutoRAE cradles are also available for the QRAE Plus, MultiRAE Plus, ,MiniRAE 2000 and ppbRAE Plus.

To see a demonstration of AutoRAE at AIHce, please visit RAE Systems booth #629 at the Anaheim 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.