- AC Output. Constant current delivers 25 amps to any ground circuit with resistance of 0 to 0.1 ohms. - Logic controlled, one button test. Lights indicate test results. Upon failure , buzzer sounds and testing is terminated. - V=irtual voltage sense circuit compensates for lead resistance. - High efficiency design results in low power consumption. - Calibration resistor mounted on rear panel. - Performs to CE, IEC, TUV safety agency requirements for production line testing. - Factory adjustable for current levels of 10 - 30 amps. - Ergonomically designed for safety, speed and efficiency. - Compact and durable. - Test leads included. - One year calibration cycle. - TEST-LINK Compatible.