FunctionMeasuring Range Precision DC voltageInput impedance:10M0.5% AC voltageInput impedance:51% On off testTest current:1mA0.010.5% Insulation testTest voltage 50V0.01M3% Test voltage 100V0.01M Test voltage 250V0.01M Test voltage 500V0.01M Test voltage 1000V0.1M 1.00G as your option