Clamp allows measurement of AC and DC current in wires without disturbing the circuits or contacting live terminals Auto range simplifies operation: 0.01-400 Amps,0.001-600 VoltsAuto power-off selection - power turns off automatically after 10 minutes of non-useTrue RMS required for accurate measurement of inverter outputLarge digital display makes reading measurements easyData hold-press "HOLD" button during measurement to lock reading valueAdditional functions include resistance/continuity and overload displayTest leads and soft case included with meter