Long service life - - - - 12v test light adopts two-pin light lamp, car fuse tester not easy to heat up be damaged after long time use Design design 'needle fixed - - - - car fuse tester The needle fixed design prevents the needle from falling off bending Safe to use- - - - Safe 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 hs from harmful materials. Spiral wire for easy storage- - - - - 6-12V AC 24V DC continuity test in power electrical systems for electrical electrical appliances on open circuit, ground or short circuit. Quickly check your vehicle's headlights, taillights, turn signal circuits, faulty sockets, connectors, fuses, wire breaks much more. Intended Use - - - - - long probe with alligator clip for testing safeties, grasping tight places piercing insulation. Allows you to check connections sockets find short circuits quickly easily. Detects short circuits line breaks in wires. Checks voltage regulators, fuses, switches, valves distributors