Features: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 : "5.5G" for insulation resistance measurement; "OL V" forvoltage measurement.Accuracy: (a% reading + digits); calibration per yearWorking Temperature: 0-35Working Humidity: 75%Working Altitude: 2000mStorage Temperature: -20~60Storage 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 Range0.00M~5.5G When Itis about less than 4.0M, buzzer outputs alarming sounds. Note:(100V)0.00M~100MOpened VoltageDC 100V10%DC 250V10%DC 500V10%DC 1000V10%RatedTest CurrentWhen load is100K, therated testingcurrent is 0.9mA~1.1mA.When load is250K, therated testingcurrent is 0.9mA~1.1mA.When load is500K, therated testingcurrent is 0.9mA~1.1mA.When load is1M, therated testingcurrent is 0.9mA~1.1mA.Shorted CurrentAbout less than 1.8mA.Accuracy0.00M~99M:3%+5digits; Package List:1 x Insulation Resistance Tester2 x Test Lead2 x Crocodile Clip1 x Black Bag1 x Gallus.