- Effortless System Checks: This versatile test pen features a wide detection range and a 13.5 ft cable, making it ideal for diagnosing various electrical systems with minimal effort. - Multiple Applications: Use this tool to test voltage, check motors and lamps, assess conductivity, and accurately trace short circuits, ensuring comprehensive automotive diagnostics. - Safety First: Built-in short circuit protection enhances performance by quickly identifying poor ground contact issues, allowing for secure and reliable testing. - User-friendly Operation: Simply attach the Voltage Tester Pen to the car's battery. Shake the power switch forward or backward to easily conduct subtractive and straight polarity tests from the battery to the tip. - Practical Use Scenarios: 1. Diagnose electrical issues in your vehicle by testing battery voltage and locating short circuits. 2. Evaluate the performance of motors and lamps, ensuring all components are functioning properly. 3. Quickly identify grounding issues, saving time and preventing potential electrical hazards. This test pen is designed for efficiency, compatibility with a range of vehicles, and materials that ensure durability and reliable performance.