Item Type: Ground Resistance Meter terial: ABS Grounding Resistance Range: 0.01Ω~20Ω, 0.1Ω~200Ω, 1Ω~2000Ω V Grounding Voltage: 0~600V AC Power Supply: DC9V (alkaline dry battery LR14 1.5V*6, continuous standby for 300 hours) (not included) Back Light: controllable white screen back light, suitable for dim places Measurement Mode: precise three-wire measurement, simple two-wire measurement Measurement Method: grounding resistance: rated current pole-changing method, measuring current 20 ximum; grounding voltage: average value rectification Data Mode: average, ximum, minimum Wire Resistance Verification: avoid the test wire not fully inserted into the instrument interface or poor contact or user replacement and lengthening; the error caused by the test wire kes the ground resistance measurement more accurate Display Mode: 4-digit large LCD display, white screen back light Measurement Indication: LED flashing indication and LCD countdown will display during measurement Test Time: ground voltage: about 3 times/second; ground resistance: about 5 seconds/time Number of Measurements: 5000 times or more (20Ω gear measure 10Ω, measure once, stop for 30 seconds and then measure) Line Voltage: measure voltage to ground: measure below AC 600V Data Storage: 400 groups, flashing "FULL" indicates that the storage is full Data Retention: data retention function: "HOLD" Data Access: data access function: "READ" Overflow Display: over-range overflow function: "OL" Alarm Function: when the measured value exceeds the alarm set value, the LCD will flash to alarm Working Current: back light: 25 ximum; standby 25 ximum(back light off); measurement: 200 ximum(back light off) Working Temperature and Humidity: -10℃~40℃; below 80%RH Storage Temperature and Humidity: -20℃~60℃; below 70%RH Overload Protection: measurement of grounding