Specification Function: Ground resistance test, Loop resistance test Power Supply: 6VDC 4 PCS of LR6 Alkaline batteries; come without battery, !!pls note buy it Separately Resistance Range: 0.01-200Ω Resistance Resolution: 0.001Ω Highest Resistance Accuracy: ±1%±0.01Ω Data memory: 99 Sets Alarm Threshold Setting Range: Resistance: 1-199Ω Alarm Sound and Light: “Beep-beep-beep” alarm tone, Alarm Symbol Flashing, Press AL key to turn on, turn off Alarm or set Alarm Threshold. Interference Signal Recognition: “Beep-beep-beep” tone, NOISE symbol blinking Working Temperature and Humidity: -20℃-55℃；20％RH-90％RH LCD Screen: 4 Digits LCD display, Screen L×W: 1.85x1.12''(47mm×28.5mm) Clamp Size: Φ1.26''(32mm) Clamp Opening Extent: 1.26''(32mm) Tester Weight: 2.5lbs(1160g) (Without batteries) Clamp Dimension: L×W×T: 11.2x3.35x2.2''(285mm×85mm×56mm) Protection Level: Dual Insulation Structural Feature: Clamp CT Shifting: Automatic shifting External magnetic field: ＜40A/m External electrical field: ＜1V/m Single measurement time: 0.5 second Resistance measurement frequency: ＞1KHz Measured current frequency: 50/60Hz Automatic measurement Low Battery Indication: Low battery symbol displays when battery is lower then 5.3V Memory Full Indication: MEM symbol blinks when all 99 sets memory is full Over Range Indication: Out of range indication “OLΩ”, “L0.01” or “OL A” Auto Power-off: 5 minutes after Boot up Power Consumption: Max 50mA either in booting up or normally working, Continuously working for 30 hours RS232 Interface (Optional): The data stored in the meter are uploaded to the computer through RS232 interface and data wire, Then generate report files Accessories: Meter: 1 piece, Test Ring: 1 Piece, Meter Suitcase: 1 Piece , Package Content Earth Resistance Tester ×1 Test ring ×1 Instrument box ×1