Digital Grounding Resistance Tester 2 3 Pole Earth Resistance Tester Meter with Range 0.01Ω to 2000Ω Resolution is 0.01Ω for Electrical Equipment Rechargeable USB Mass Storage
Digital Ground Resistance Tester Measuring Method:Earth ground resistance: rated current change-pole method, measurement current 3mA Max,820Hz; Earth Voltage: average value rectification