Digital Micro Ohm Meter 300K Megometer Resistance Meter Insulation Tester USB Data Transfer ,Easy to Use

Open circuit voltage:4.2V Operating temperature:18-28; below 70%rh Storage temperature:-15-50; below 70%rh Insulation resistance:Above 10M (the voltage between circuit and shell: 500V) Withstand voltage:AC 3700V(between circuit and shell)