When you are diagnosing circuits, the POWER PROBE 4 gives you the confidence to safely test circuits. We connected it to the driver output from the engine control unit. We saw there was good ground, however when using Driver Test Mode to reference the transistor in the circuit to ground. With 1 volt displayed we realize it’s a faulty Control Unit caused by a bad transistor. Once replaced, the display on the PP4 shows a green light and a 0.2 volt reading, showing a perfect tolerance. Using the Dr

The PP4 from POWER PROBE is a ver y powerful tool than can be very helpful in the car diagnosis. Features: -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. -Component Tester -AC-RMS, AC Peak to Peak, Frequency and Pulse Width indicators are available for signal testing -Fuel Injector tester for easy ci