With the earth loop measuring clamp, you can test the earthing components of systems in hard-to-reach places, e.g. indoors or in fully paved areas where earth spikes cannot be driven in. Measure without disconnecting: You can measure ground loop impedance without disconnecting and reconnecting the grounding electrode to the system.The Fluke 1630-2 ground loop clamp meter is a high-quality, rugged tool with proven Fluke quality. The high-performance clamp remains aligned and calibrated - even with daily use in demanding industrial environments.