- Efficient Circuit Testing: The 13.5 ft cable allows you to easily maneuver through various electrical systems for precise and straightforward diagnostics. - Versatile Applications: Use this test pen to measure voltage, check motors and lamps, assess conductivity, and effectively trace short circuits, making it ideal for comprehensive automotive diagnostics. - Safety First: Equipped with built-in short circuit protection, this tool instantly identifies issues such as poor ground connections, ensuring a reliable and secure testing experience. - User-Friendly Operation: To test polarity, connect the Voltage Tester Pen to the car's battery and shake it back and forth to conduct straight and subtractive polarity tests. Applications include: 1. Quickly diagnosing electrical faults in vehicles to enhance repair efficiency. 2. Assessing the functionality of automotive lamps and motors during routine maintenance. 3. Locating and tracing short circuits in complex electrical systems to prevent costly repairs.