Features:This insulation resistance tester can measure insulation resistance, AC voltage, etc.High degree of accuracy, stable performance, easy operation and reliability. Support automatic measurement, low battery indication, LCD backlight, alarm light display, alarm buzzer.Widely used for insulation resistance measurement for insulation materials and various kinds of electric equipments such as transformer, electric machines, cables, switches, electrical appliances.I is a ideal tool for electric equipment maintenance, testing and inspection.Specification:Display: LCD, 1999 countOverload Indication : "＞5.5GΩ" for insulation resistance measurement; "OL V" forvoltage measurement.Accuracy: ±(a% reading + digits); calibration per yearWorking Temperature: 0-35℃Working Humidity: ≤75%Working Altitude: 2000mStorage Temperature: -20~60℃Storage Humidity: ≤80%Battery: 6pcs x 1.5V Battery (NOT included)Size (Approx.): 150*100*71mm/5.9*3.9*2.8inWeight (Approx.): 837g/29.5ozInsulation Resistance MeasurementRated Voltage100V250V500V1000VTest Range0.00MΩ~5.5GΩ （When Itis about less than 4.0MΩ, buzzer outputs alarming sounds）. Note:(100V)0.00MΩ~100MΩOpened VoltageDC 100V±10%DC 250V±10%DC 500V±10%DC 1000V±10%RatedTest CurrentWhen load is100KΩ, therated testingcurrent is 0.9mA~1.1mA.When load is250KΩ, therated testingcurrent is 0.9mA~1.1mA.When load is500KΩ, therated testingcurrent is 0.9mA~1.1mA.When load is1MΩ, therated testingcurrent is 0.9mA~1.1mA.Shorted CurrentAbout less than 1.8mA.Accuracy0.00MΩ~99MΩ:±（3%+5digits）; 100M ~5.5GΩ: ±（5%+5digits）Voltage MeasurementAC VoltageTest Range30V~750V(50Hz/60Hz)Resolution1VAccuracy±（2%+3digits）Package List:1 x Insulation Resistance Tester2 x Test Lead2 x Crocodile Clip1 x Black Bag1 x Gallus.