G-check is a continuous checking and measurement of earthing. It has been provide with an auxiliary output , which is activated when the earthing value is higher than the predefined user value. It can operate on contactors or other shut-down devices . Available in 120V and 230V , for TT, TNS and TNC-S systems. The most important features of this device are : - Earth resistance measurement and monitoring - Local and remote alarm - Measured value adjustment.