FT6380-50 Earth Resistance TesterThe Hioki FT6380 50 measures grounding resistance simply by clamping to multiple grounded ground wires. No auxiliary grounding rod is needed, and there is no need to disconnect the ground wire from the grounding rod. The compact, low profile sensor can be used to clamp ground wires with ease, also provide AC current measurement functionality, and can measure currents ranging from leakage current on the order of several mA to load currents of up to