1. VERSATILE AND MULTI PURPOSE This Car Truck Circuit Test Pen is designed to check circuits, switches, and wiring on a variety of vehicles including cars, trailers, boats, and motorbikes. Its low voltage system compatibility makes it an essential tool for any automotive enthusiast or professional mechanic. 2. BI DIRECTIONAL TEST MODE Experience enhanced clarity with the digital display that shows test results accurately. The bi directional voltage circuit tester allows you to connect the clamp to either negative or positive ground. The light emitting diode on the circuit board indicates polarity with a red light for positive and a green light for negative, ensuring precise diagnostics. 3. PROFESSIONAL GRADE TOOL With a test range of 3V to 70V DC, this circuit test pen is ideal for checking the circuitry of a wide range of vehicles. It quickly identifies issues in car headlights, taillights, turn circuits, and faulty sockets, making it a must have for any automotive toolkit. 4. MATERIALS The carbon steel probe is for piercing wires and accessing difficult to reach confined areas. The heavy duty test light body is made from grade ABS plastic, which is shatterproof and more durable than ordinary test lights, ensuring long lasting performance.