DT-500 406 insulation tester. The DT-500 checks insulation resistance for systems or devices. A 500 V measuring voltage delivered by the device is used to perform this check (in compliance with NF C15-100). Phase / neutral shunt function. Battery-saving function. Live voltage indicator and battery status indicator. Belt clip on the back of the device. Supplied with leads, test prods, alligator clips, batteries, manual and carry case.