The Power Probe 4 master combo kit combines the Power Probe 4, ECT3000 & Gold Series lead set to provide the ultimate combination of diagnostic and circuit testing capabilities. The Power Probe 4 simplifies the testing of fuse boxes, verifies correct operation of motors, lights, relays, sensors, wires, communications circuits and computer drivers. The PPECT3000 will help you trace short and open circuits quickly and accurately. Features: PP4 Supply Power or Ground for Functional Component Testing Self-Resetting Thermal 8 Amp Circuit Breaker Multiple DC Volt readings on the same display Ohmmeter provide active feedback 12 – 24 Volt Range Bad Ground Indicator Continuity Tester