The MRU-200 from Sonel is the top model in the MRU series and the only grounding measurement device on the market that performs all possible measurement methods in the field of grounding measurement. Notably, it features the lightning protection method for testing lightning rod systems under nearly real conditions. With extensive measurement accessories such as current clamps, 25-meter long measuring cables, and auxiliary electrodes, grounding measurements and resistance measurements can be easily conducted in any environment and on any grounding and lightning protection system without the need to disconnect the ground. Additionally, a professional grounding analysis can be performed based on the measured disturbance voltages and disturbance frequencies.