Micro Ohmmeter, Calibration Certificate Yes, Communication Protocol USB, Maximum Insulation Resistance 250 microohm, Minimum Insulation Resistance 0 kiloohm, Number of Digits 5, Power Source 120V AC 60Hz or Battery, Includes 7Ah NiMH Battery Rechargeable, Lid Mounted, Supplied with Hand Spikes, Test Lead Pouch, User Guide CD