ASSOCIATED RESEARCH, INC., Lake Forest (near Chicago), Illinois
Electrical safety compliance testing Instruments: hipot, IR, continuity, ground bond, leakage, power monitor

BEHLMAN ELECTRONICS, INC., Hauppauge (Suffolk County, Long Island), New York
Programmable AC power sources and frequency converters; UPSs; inverters; DC-DC converters

SLAUGHTER TEST SYSTEMS, Ardmore, Oklahoma
Motor armature and stator test systems, surge testers, battery testers

THERMO SCIENTIFIC KEYTEK, Lowell, Massachusetts
Simulators: ESD, EFT/burst, EOS/surge, magnetics, dips/interrupts
Discrete device and circuit board testers: ESD (HBM, MM & CDM) and latch up

TRANSIENT SPECIALISTS, INC., Western Springs (near Chicago), Illinois
Thermo KeyTek equipment rental and used equipment sales