The C.A 6416 and C.A 6417 are ground resistance testers that easily perform tests earth loops in a safe manner. They are designed for regular use and requires a minimal effort in operating. Its lightweight yet durable design are fabricated from optimized magnetic materials. This equipment includes a display of ground voltage and a new force compensation system that aids in the opening of the clamp. Its installed with an OLED display with 180 ° viewing angle, making it easier to read in extreme conditions. The ground resistance tester has an automatic pre-hold function and enables Bluetooth communication as well. It is also compatible with Android and performs geolocation and instant measurement transmission.