DI Corp. engages in the manufacture and sale of semiconductor testing equipment. It operates through the following business divisions: Semiconductor Testing Equipment, Electronic Parts, Environmental Facilities, Audio Equipment, and Secondary Battery. Its products include multi flexibility tester, monitoring, test, and wafer level burn-in testers, burn-in board, wafer test board, electromagnetic wave shielding and absorber, thermal interface material, hydro block, ultraviolet disinfection system, sludge collector, all-in-one music center, headphone amplifiers, and audios. The company was founded in 1955 and is headquartered in Seoul, South Korea.