[Short Circuit Following and Locating Probe]This circuit tester is suitable for diagnostic in all 6V to 24V DC vehicle electrical systems. It can check switches, relays and the on-off of diodes, fuses and circuits, which can help you reduce diagnostic time in automotive electrical systems. In most cases, short circuit or overload of component will lead to blown fuse or circuit breaker tripping. This probe can assist you tracing problem wires and locating breaking points.[Polarity Identification & Continuity Testing & Jumper Lead Operation]This probe can help you quickly identify positive and negative polarity of electric cables and plugs of vehicles. When the probe tip contact to the positive electrode, the RED light on. When the probe tip contact to the negative electrode, the GREEN light on. It can also test for continuity and do the jumper lead operation with the assistance of its auxiliary ground lead.[Activate and Test Components In/Out of Vehicle's Electrical System&Poor Ground Contact Testing]Circuit tester could activate components in and out of the vehicle's electrical system, test and check the components if defective or not, or if rating current of component is higher than that of the circuit tester. For some components, the negative terminal is required to be well grounded to cope with the flow of currents, this circuit tester is a good tool to test their grounding.[13FT Long Extension Cable&LED Light Prompt&Buzzer Warning&Highly Sensitive Probe&Clips with Strong Bite]The cable length of the circuit tracer is about 4m(13ft) which allows you access and test any electrical system easily. The LED indicator and buzzer warning can help you clear problems at a glance. Circuit tester adopts advanced high sensitivity probe, which provides you quick and accurate detection. Its clips with strong bite force which noteasy to fall off, providing you better experience.[Quick Self-Test & Overload Protection]Before you test a circuit or component, the probe can perform a quick self-test to your tool is in good condition. Equipped with overload protection, when the current exceeds 7A, the probe will disconnect the current automatically and give you a buzzer warning. You can test poor ground contacts directly. Note: This electrical tester can not be used for 110/220V systems, it is only used for DC 6-24V systems. Do not use on AC voltage.Colour: BlackMaterial: PlasticPackage Contents:1 x Probe Short Circuit TesterOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.