The Electronic Specialties EV Insulation Tester, No. 550, is designed to check high-voltage circuits on electric and hybrid vehicles for voltage leaks to ground. It can supply 250V, 500V, and 1,000V test voltages for doing complete insulation testing. The 550 also serves as a capable volt/ohm meter with a large, dual-backlit LCD display. Additionally, the 550 is rated CAT III 1,000V for overvoltage protection. Includes six AA batteries, test leads, instruction manual, and blow molded case.