The UT522 is an earth resistance tester with a larger range and higher count than other meters from the UT520 series such as the UT521. Earth resistance meters are intended to make measurements on the grounding of electrical systems. Various applications need to have a good earth connection, for example, to dissipate over-voltages or lightning strikes. Earth testers work with pins that must be inserted into damp ground. In addition, a connecting wire for the measuring object is included for comparison with the earth. The pins provided are intended to measure the resistance of the soil to see if the soil is suitable for inserting a grounding pin. The meter can perform both 2 and 3-wire resistance measurements, in addition, it is possible to measure the ground voltage.