Product Name: Insulation Resistance Tester (IT811B) Model NO.: IT811B Trademark: OEM Origin: Shenzhen, China Product Description IT811BFeatured with large LCD display, backlight, holding data. Insulation resistance test with auto range. It has the construction of shakeproof, dustproof, dampproof and can be suitable for outdoor working environment. It applies to IEC61010.(1) Low power consumed CMOS double integral A/D transforming IC, auto-checking to zero, auto-displaying polarity, displaying when low or over battery.(2) LCD: 3 1/2 digits big screen display, the max show value is 1999.(3) Has function of holding data and displaying signal.(4) Can use rotating switch when testing voltage.(5) Voltage below AC750V can be tested.(6) High voltage is on the rails when LED is on.(7) Displaying when low battery.(8) Drove by Battery not by hand.(9). Auto switch the range when resistance measuring(10) With strong load, approx. 1.0mA output short current.(11) Perfect circuit protect, preventing damage by voltage shock effectively.(12) Size of LCD: 6844mm (Height of character is 32mm).(13) Power: Six battery5# which is 1.5V (R6AA SUM-3).(14) Size of shape: 2019355mm.(15) Weight: 600g (contain battery).(16) Environment:Working temperature: 0~40,Relative humidity<80%Storage temperature: -10~50,Relative humidity<85%Temperature to ensure precision: 23º C± 5º C,Relative humidity<75%Model1000V2500V5000VIT811+ IT811IT811AIT811BInsulation Test Voltage100V/250V/500V/1000V250V/500V/1000V/2500V500V/1000V/2500V/5000VInsulation Resistance1MΩ -2000MΩ1MΩ -20GΩ1MΩ -20GΩ1MΩ -200GΩBasic Accuracy± (3%+5)AC Voltage1~750V (50-60Hz)