Kyoritsu 3125 digital insulation tester has wide range measurements from 500V to 5000V and up to 1000GΩ, large digital LCD display with bar graph indication and backlight, 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.