VERSATILE: The automotive voltage tester is suitable for diagnosing all electrical systems in vehicles with 6 to 24 V DC. It can check switches, relays and the on/off switching of diodes, fuses and circuits, which can help you to reduce diagnostic time in vehicle electrical systems. POLARITY AND CONTINUITY TESTING: This power circuit probe allows you to quickly determine the positive and negative polarity of automotive electrical wires and connectors. It can also test continuity and perform a bypass using the additional ground cable. TRACKING & LOCATING SHORT CIRCUITS: The current tester uses advanced high-sensitivity probes to provide you with fast and accurate detection. With the continuity tester, you can save a lot of time when troubleshooting vehicle wiring and quickly and accurately find the faulty wire and its fault point. COMPONENT ACTIVATION AND TESTING: This automotive test lamp can activate components in and out of the vehicle's electrical system to test and verify whether the components are defective or not, or when the rated current of the component is higher than that of the circuit tester. HUMANISED DESIGN: The cable length of the auto tester is about 13.5ft, which allows you to easily reach and test any electrical system. The LED display and buzzer warning can help you identify problems at a glance. Its clips have strong bite force, which is not easy to fall off, providing you with a better experience. Product details: Colour: red/blue Operating voltage: 6-24V DC Cable length: 13.5ft Overload protection: 8A (when the current exceeds 8A, this item will automatically cut off the power). Package size: 27.6 * 9 * 4cm Package weight: 320g Packing list: 1 * circuit tester 2 * manual