The Vitrek V685 can identify circuit connectivity and insulation defects. Given most cable testers can find opens and shorts, the Vitrek V685 goes the extra distance to verify insulation integrity. Comes with three distinct operating modes, AC Voltage Withstand (AC hipot) up to 1000VRMS, DC hipot up to 1500VDC and Insulation Resistance measurement up to 1000 Meg ohms.