INSULATION RESISTANCE - Test Voltage (DC V): 250V/500V/1000V - Output Voltage Open Circuit+ 10% - Measuring Ranges (Auto): 0-20/0-200/0-2000M Ohm - Accuracy: 0-20M Ohm : +/- (1.5%rdg+2dgt), 0-200M Ohm : +/- (2.5%rdg+2dgt), 0-2000M Ohm : +/- (5%rdg ...