Aehr Test Systems engages in the design, manufacture, market, and sale of test and burn-in equipment used in the semiconductor industry. Its products include FOX-XP, FOX-NP, and FOX-CP wafer contact parallel test and burn-in systems, the WaferPak full wafer contactor, the DiePak Carrier, the WaferPak Aligner, the DiePak Autoloader, and test fixtures. The company was founded by Rhea J. Posedel on May 25, 1977 and is headquartered in Fremont, CA.