The PP3 literally speeds you through the diagnosing of 12 to 24 volt automotive electrical systems. After connecting the PP3’s clips to the vehicle’s battery, the automotive technician can determine at a glance, the voltage level and the polarity of a circuit with out running for a voltmeter or reconnecting hook-up clips from one battery pole to the other. The power switch allows the automotive technician to conduct a positive or negative battery current to the tip for activating and testing the function of electrical components without wasting time with jumper leads. And yes, the PP3 is short circuit protected. It tests for bad ground contacts instantly without performing voltage drop tests. It allows you to follow and locate short circuits without wasting precious fuses. The Power Probe can also test for continuity with the assistance of its auxiliary ground lead.