With the grounding clamp C.A 6417, which comes in its transport case, loop resistances of groundings can be quickly measured. The C.A 6417 is designed for 600 V CAT IV and displays the contact voltage with an alarm for hazardous voltages, providing additional safety during measurements. The use is facilitated by ergonomic innovations: a force-compensating system means that only a small amount of force is needed to keep the clamp open, and an OLED display ensures readability from a 180° angle under all lighting conditions. The automatic pre-HOLD mode when the clamp is open and the automatic calibration of the iron gap under voltage ensure optimal evaluation of the values measured with the clamp. Grounding clamp for measuring ground loops without ground spikes and without opening the separation point.