The innovative earthing clamp is ideally suited for the precise measurement of the earthing resistance without the aid of auxiliary earth electrodes. Earthing clamps can be used in multiple-earthed systems without having to disconnect the earthing to be checked. The earthing tester has a large oval clamp diameter (32 mm x 64 mm) and delivers fast, safe and accurate results. The T2100 is equipped with an RS-232 interface, which enables data transfer of the measured values to the VDE 0100 measuring device COMBI G3 for subsequent protocol creation on the PC. The earthing clamp is equipped with an automatic shutdown and an LCD backlight, which enables measurements to be carried out in poorly lit environments.