Micro Ohmmeter, Calibration Certificate Included, CAT Safety Rating Not Rated, Display Type Digital, Insulation Resistance Resolution 10 microohm, Maximum Insulation Resistance 4 kiloohm, Minimum Insulation Resistance 40 microohm, Power Source Battery, Auto Power Off Yes, Auto Ranging Yes, Battery Size 1.5V, Display Screen Type LCD, Display Size 0.6 in