... , electrical device, lighting protection device,etc. This tester can measure grounding resistance and AC voltage to 220V.2mA current test signal permits ... is easy to use and has a high precision. Earth Voltage: 200V 1.2%rdg+3dgtsEarth Resistance: 20Ω 2%rdg+10dgts ... simple-test lead, red simple-test lead, normal-test lead, voltage test lead, auxiliary earth bar, etc.