Long service life: adopts two-pin bright lamp, not easy to heat and damage after long time use Telescopic needle design: The telescopic needle design prevents the needle from falling and bending. Safe to use: Safe and easy to use, there is no heat in operation.The sharp steel probe grips 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 electrical and electrical systems for electrical and electrical devices on break, ground or short circuit.Quickly check your vehicle's headlights, taillights, turn signal circuits, faulty outlets, connectors, fuses, wire breaks and more. Intended Use: Long probe with alligator clip for testing safeties, gripping tight spots and piercing insulation.Allows you to check connections and outlets and find short circuits quickly and easily.Detects short circuits and line breaks in wires.Checks voltage regulators, fuses, switches, valves and distributors