Item Type: Earth Ground Resistance Meter_x000D_ Material: Plastic_x000D_ Host Size: Approx. 150x150x70mm/5.9x3.93x2.76in_x000D_ Battery Model: _x000D_ 6 x 1. 5V(R6AA) battery_x000D_ 1 x 12V(23A) battery_x000D_ Battery is not included in the accessory_x000D_ _x000D_ Functions: _x000D_ Overvoltage protection_x000D_ Data hold_x000D_ low battery warning_x000D_ High accuracy _x000D_ LCD digital display screen_x000D_ Outdoor dust wet proof_x000D_ _x000D_ Resolution: 0.01 ohm_x000D_ Data Hold: Yes_x000D_ Working LED Indicator: Yes_x000D_ Function Symbol Display: Yes_x000D_ _x000D_ Specification:_x000D_ 1. Measuring Range Of Earth Resistance: 0-2000. 0/20/200/2000 ohm (2%+3)_x000D_ 2. Measuring Range Of Earth Voltage: 0-30V(3%+5)_x000D_ 3. LED green light indicates normal operating mode._x000D_ 4. 31/2 digit LCD display for more direct and convenient reading._x000D_ 5. Low Battery Warning: _x000D_ on LCD indicates deficiency of 12V battery. _x000D_ LED red lighting off indicates deficiency of 1.5V battery._x000D_ 6. Response Time: Measure earth resistance, about 5 seconds. Measure earth voltage, about 2 seconds._x000D_ 7.Withstand Voltage: AC 500V, 1 minute between circuit and outer casing._x000D_ 8. Overload Protection: On earth voltage, can withstand 300V AC 1 minute . _x000D_ on earth resistance, can withstand 200V AC 10 seconds ._x000D_ 9. Working Environment: _x000D_ Working Temperature: 0-40 relative humidity < 80%_x000D_ Storage Temperature: - 10-50 relative humidity < 85%_x000D_ Ensured Accurate Temperature: 235_x000D_ relative humidity < 80%_x000D_ _x000D_ Operation Instruction: _x000D_ a. Battery Voltage Inspection_x000D_ b. 3-wire Earth Resistance Test_x000D_ _x000D_ NOTE: Maximum 50V voltage may be generated between E-C or E-P terminals when testing earth resistance_x000D_ Please do not touch testing lead to avoid electric shock._x000D_ Please make sure testing wire plug insert in testing_x000D_ terminal thoroughly before testing since loose connection may cause error in testing result._x000D_ _x000D_ 1) Testing Wire Connection_x000D_ As shown in picture below, punch assistant earth bar P1and C1 in earth 5 to10 meters distant from tested earth substance; connect green wire to terminal E, yellow wire to terminal P and red wire to terminal C_x000D_ 2) Inspection of Power Supply and Wire Connection Press Test/Stop , POWER light off indicates insufficient 1.5V battery. Please replace it._x000D_ OK light on indicates normal connecting of lead and E, C terminals, and auxiliary earth resistance is within permitted range. If light is off, check the lead connecting E and C terminals or change the position of_x000D_ earth bar, or water the land to lower auxiliary earth resistance to a proper level. Check breakage by short circuit of spring clamps of red and green lead ._x000D_ 3) Earth Voltage Measurement_x000D_ Please turn the range select switch to earth voltage.Make sure the voltage value below 10V since error may occur to measuring value of earth voltage if the voltage value above 10V. At this point, one can break the power supply of tested earth electrode equipment to lower earth voltage and then measure the value_x000D_ 4) Earth Resistance Measurement_x000D_ First please press Test/Stop beginning from2000 ._x000D_ If the shown value is too small, switch to 200/20 and the s 1It can test the grounding resistance of various grounding systems, including power systems, electrical equipment, lightning rods, and low?resistance conductor resistance and AC voltage tests. 2More complete functions, higher accuracy, more convenient operation, more reliable, and more suitable for outdoor use with dust?proof and moisture?proof structure. 3The circuit, structure and technology of the traditional grounding resistance tester have been improved, and the new design is both beautiful and practical. 4Contains testing wires and necessary matching accessories, which can provide much convenience for your using. 5LCD digital display, overvoltage protection, data retention, low battery warning, outdoor dust?proof and moisture?proof. 1 x Detector 1 x Manual 2 x Auxiliary Ground Rod 2 x Test Line 1 x 15m Red Test Line 1 x 10m Yellow Test Line 1 x 5m Green Test Line 1 x Tool Bag