Automotive circuit probe This power circuit probe is the best electrical tester to reduce diagnostic time on all 6 to 24 volt vehicle electrical systems. It is a useful tool for determining the presence of power and a means of safely powering fans, motors, and circuits. feature: This circuit probe is an electrical tester designed to reduce diagnostic time on automotive electrical systems. Suitable for all 6-24V, including cars, boats, trailers, relays and more, can test continuity, test polarity, test for bad ground contacts, check switches, relays and diodes, fuses and circuit switches, track and locate short circuits. A great helper for professional mechanics and home users multifunctional: Polarity test continuity test Ground test Short circuit tracking and positioning Test components in a vehicle's electrical system Testing components of vehicle electrical systems Jumper test self test LED indicators and buzzer warnings let you troubleshoot problems at a glance Helps you test the positive and negative polarity of contacts in vehicle circuits The probe tip touches the positive "+" and the LED indicator light turns on. The probe tip touches the negative electrode "-", and the green indicator light turns on. Activate components in the vehicle's electrical system When the component control switch is on the positive side of the component, press the button to the "-" side, and the LED light will turn red. Touch the tip of the probe to the positive terminal of the component. The component will be activated. Activate components outside the vehicle's electrical system Using a probe along with an auxiliary ground wire, the component can be activated and thus its functionality tested. Highly sensitive probe provides you with fast and accurate detection The clamp has strong bite force and is not easy to fall off 13-foot cable lets you easily access and test any electrical system Warm reminder: Because the tip of the probe is sharp, be more careful when operating it. Package Contents: One Diagnostic Tool