(REI) Research Electronics International specializes in the design and manufacture of electronic test equipment for security applications. The company was founded in 1983 in Cookeville, Tennessee, U.S.A. by Bruce Barsumian, who later partnered with Tom Jones (GM) in 1995. In June 2019, (REI) Research Electronics International became an Electronic Technologies subsidiary of HEICO Corporation (Hollywood, FL, USA). (REI) Research Electronics International customers include government agencies, law enforcement organizations, corporate security personnel, and TSCM professionals worldwide that have a need and responsibility to protect sensitive information.

For over thirty years, (REI) Research Electronics International has been manufacturing its entire product line in-house. A team of individuals works together, each an expert on the component for which they are responsible, to hand-craft every product. REI sees, touches, and tests each product before it is shipped out. With complete control over the manufacturing process, customers never have to be concerned with whether a third-party company is dedicated to the quality of the products. Products are not batch manufactured just to sit on a shelf. Low volumes are maintained to allow for adaptability to change. The engineering and production departments work in tandem, making software and hardware that are specifically designed for each other. From beginning to end, REI knows that each element is going to work together seamlessly. Each time a customer places an order with REI, they can be confident that it meets the highest standards.

REI has the largest commercial TSCM training facility in the world. Courses are designed to teach the basic and advanced procedural concepts of conducting a counter surveillance investigation. Six full-time, highly qualified instructors have over five decades of cumulative experience in the surveillance field. All courses are hands-on, using state-of-the-art technical security equipment. Depending on the situation, surveillance investigations can require many types of equipment to be successful. Students will be exposed to many types of equipment­—not just REI-manufactured. Unique training rooms simulate environments with suspect devices including RF transmitters with analog and digital modulation techniques, hidden surveillance cameras, tapped telephone and LAN lines, infrared devices, and carrier current devices.