Frequency Range: 45Hz ~ 450Hz,, AC Voltage: 750V, Resolution: 1V, Accuracy: ±(1.2% of rdg+5D),, DC Voltage: 1000V, Resolution: 1V, Accuracy: ±(1.0% of rdg+5D),, DC Voltage: 1000V, Resolution: 1V, Accuracy: ±(1.0% of rdg+5D),, Insulation Test Range: 20M?~2000M?, Accuracy: (±2% +2)~(±5% +2)