Fangrui Product Details 1. Benetech Gm3123 High Voltage Insulation Tester 2. Features 3. Auto Discharge Function To Make The Operation Safe 4. Lcd Backlight 5. Digital Readout Display 6. Live Circuit Warning Symbols With Audio Sounds 7. Anto Power Off Function (in 10 Minutes Without Operation) 8. Timer Measurement Function 9. Low Battery Indication 10. Suitable For 12v Dc Adapter (12v 1a) 11. Specifications 12. Display: Max. 999 Counts Lcd Display (1000 Counts Only At 1t Is Displayed) Bar Graph Max. 36 Points. 13. Over Range Indication: Ol Mark Appears On Insulation Resistance Range. Lo Mark Appears On Voltage Range 14. Auto-ranging: Range Shifts To Upper Range: 1000 Counts. Range Shifts To Lower Range: 95 Counts (merely On The Insulation Resistance Range) 15. Sample Rate: 0.5-10 Times Sec 16. Operable Altitude: Less Than 2000m (indoor Use) 17. Operation Circumstance: Temperature 0-40 Celsius Degree, Humidity: <= 18. Storage Circumstance: Temperature -20-60 Celsius Degree, Humidity: <= 19. Overload Protection: Insulation Resistance: Ac 1200v 10s, Voltage: Ac 720v 10s 20. Voltage Resistance: Ac8320 (5060hz)5 Seconds (between Electrical Circuit And Enclosure) 21. Insulation Resistance: 1000m Of More Dc 1000v (between Electrical Circuit And Enclosure) 22. Power Supply: Dc 12v (8 X 1.5v Lr14 Batteries) (included) 23. Size: 153mm X 96mm X 220mm 24. Weight: 1032g (without Batteries And Test Wires)