The MRU-120 grounding measuring device from Sonel, part of the mid-range MRU series, is equipped with the fundamental 2-, 3-, and 4-pole grounding measurement methods. Additionally, measurements can also be performed using clamps without disconnecting the grounding connection. With extensive measuring accessories such as current clamps, 25-meter measuring cables, and auxiliary electrodes, grounding measurements, specific earth resistance, and PE resistance measurements can be easily carried out in any environment and on any grounding and lightning protection system.