Long service life -------- 12v test light adopts two-pin light lamp, car fuse tester not easy to heat up and be damaged after long time useDesign design needle fixed -------- car fuse tester The needle fixed design prevents the needle from falling off and bendingSafe to use-------- Safe and easy to use, there is no heat in operation. The sharp steel probe grabs into fuse boxes or drills through insulation to contact the wire, so you can protect your hands from harmful materials.Spiral wire for easy storage- ------- 6-12V AC and 24V DC continuity test in power and electrical systems for electrical and electrical appliances on open circuit, ground or short circuit. Quickly check your vehicles headlights, taillights, turn signal circuits, faulty sockets, connectors, fuses, wire breaks and much more.Intended Use ----- --- long probe with alligator clip for testing safeties, grasping tight places and piercing insulation. Allows you to check connections and sockets and find short circuits quickly and easily. Detects short circuits and line breaks in wires. Checks voltage regulators, fuses, switches, valves and distributors