Feature: 1. It can be used to measure the ground resistance value of various power facility wiring, electrical equipment, anti thunder equipment and other grounding devices, and it can also measure ground voltage. 2. This professional digital insulation earth resistance tester has stable performance and reliable result. A variety of gears are suitable for more environments, and the voltage and resistance gears can be switched. 3. Reinforced insulation safety structure and double insulation safety make the measurement safer and more assured. 20 sets of data can be stored. 4. It has more complete functions, higher accuracy. It is equipped with a warning of poor contact of the test line, over range display, and over range display OL. 5. Comes with a portable carrying case, easy to carry, more convenient and reliable for operation and more suitable for outdoor use. Specification: Item Type: Earth Resistance Tester Material: ABS+Alloy Steel Color: As shown in the picture Model: GT5105A Battery: 1.5V AAx6 (not included) Application: Ground resistance measurement Ground Voltage Measurement: Average response Grounding Resistance Measurement: Test signal frequency: about 820Hz, current: 20Ω about 3.2mA Working Temperature: 5~40℃ Relative Humidity: ≤80%RH (no fog) Altitude: ≤2000m Storage Conditions: Temperature: -20~60℃; humidity: ≤70%RH (no fog) Grounding Resistance Gear: 200V AC (10s) Grounding Voltage Gear: 400V AC (30s) Insulation Resistance: The insulation resistance between the measuring circuit and the shell is not less than 20MΩ Basic Function Range Accuracy Resolution Ground Resistance 20Ω ±(2%+10) 0.01Ω 200Ω ±(2%+3) 0.1Ω 2000Ω ±(2%+3) 1Ω 2000Ω (two wires) ±(2%+5) 1Ω Ground Voltage 200V ±(2%+5) 0.1V . Package List: 1 x Earth Resistance Tester(Battery Not Included)2 x Grounding Nails3 x Crocodilian Clip Line(5m, 10m , 20m)1 x Instruction Manual1 x Portable Carrying Bag Note: Make sure that the grounding nail is inserted in the moist soil. If the soil is dry, you must add enough water and the stone or sandy ground must become damp before testing. Use the existing auxiliary grounding nails) to lay flat on the concrete floor, put a wet towel, and pour enough water to replace the measuring electrode. Generally, the measurement can be carried out.