... (Ω), Resistance resolution: 0.001Ω, Current Range: 0.00mA-20.0A, Current resolution: 0.05mA, Data memory: 99 sets, Alarm ... need to disconnect the ground wire without auxiliary electrode, which means safer and faster. ETCR Clamp Earth Resistance Tester ... , More fixed structure, Easy operationBatteryCoverNo screws, Easy to result in accident hidden trouble due to battery off.With fastening screws ...