... mA LCD,RS232 Application: IM 515B Digital Insulation Tester can be used to measure insulation resistance, DAR(R60s/ R15s), PI(R10min/ R1min ... -Simple connection, one HV cable, another one signal wire-Measurement range up to400 GW.-High anti-interference ability, can be used at ... -270Vac,50/60Hz. Powered by the Grid or generator -Working temperature: -10-40°C, -RH20-80% -Battery duration: 6-12 hours ...