Kyoritsu 3125A high voltage insulation tester has wide range of insulation tester measurements 250V to 5000V and up to 1000GΩ, large digital display with bar graph indication and back light, polarization index measurement, timer measurement function, indication of output voltage and discharge voltage, auto-discharge function and voltage output warning function, auto power off and battery check, safety standard IEC 61010-1 CAT III 600V.