1.SENSITIVE MEASUREMENT: Circuit Probe Tester is equipped with sensitive short - circuit detection function. Using this automotive test light can save a lot of time troubleshooting automotive wiring circuits, quickly and accurately find the faulty wires and their fault points. 2.WIDELY APPLIED: It is suitable for diagnosing all 6V to 24V automotive electrical systems and works well on cars, trucks, boats, trailers and motorcycles; it is an excellent tool for automotive electricians and mechanics to effectively reduce diagnostic time. 3.FLEXIBLE USE: Comes with a 14.8 - foot cable that plugs into the back of the vehicle for flexible use. You can use it to detect short circuits and quickly locate bad grounds for 6V to 24V systems. 4.PORTABLE DESIGN: Compact size, light weight and portable. This power circuit tester is easy to store and carry, providing you with fast and accurate testing.