- Versatile Testing Tool: This professional automotive heavy-duty circuit test pen is specifically designed for testing 6-12V DC voltage, making it ideal for a wide range of automotive applications. - Durable Construction: Featuring a handle made from high-quality copper and a quenched and tempered carbon steel probe with chrome plating, this test pen is built to last. The sharp steel probe easily pierces wire insulation, ensuring convenient access for circuit checks. - Fault Detection Made Easy: Once the circuit connection is established, the light on the handle illuminates, allowing for quick detection of faults in low voltage circuits commonly found in traffic and transportation machinery. - Comprehensive Functionality: This tool enables fast checks for automotive headlights, taillights, turn signal circuits, faulty sockets, connections, fuses, and broken wires. It’s the perfect companion for both professional mechanics and DIY enthusiasts. - Practical Applications: 1. Use it to diagnose issues in vehicle lighting systems, ensuring safety and compliance on the road. 2. Quickly identify faulty connections in trailers and transport machinery to prevent breakdowns during operation. 3. Efficiently troubleshoot electrical systems in various automotive applications, enhancing repair speed and accuracy. With its reliable performance and robust design, this circuit test pen is an essential tool for anyone working with automotive electrical systems.