- LED Work Indicator: This tool features a built-in LED light that illuminates when the circuit connection is established, clearly indicating that the power supply is active. The dual polarity indicators show green for positive and red for negative, ensuring you can easily identify connections. - Sharp and Practical Design: Equipped with a durable, sharp steel probe, this test pen effortlessly pierces wires for effective electrical circuit inspection. Its long probe and robust alligator clip make it ideal for accessing hard-to-reach areas, enhancing your efficiency during testing. - Powerful Functionality: This circuit detection test pen is versatile, capable of detecting fuses, identifying positive and negative power supplies, assessing battery power, testing LAN circuits, distinguishing real versus virtual current, and identifying poor grounding. It also reads fault codes, Hall sensors, and detects line short circuits. - Wide Compatibility: Designed for professionals, this 6-24V Circuit Detection Test Pen is perfect for use in vehicles, including cars, trailers, boats, and motorcycles, as well as other low voltage systems. It is an essential tool for anyone working with electrical circuits. Use Scenarios: 1. Quickly diagnose electrical issues in your car or motorcycle, ensuring safe and efficient operation. 2. Efficiently test and troubleshoot wiring in trailers or boats, preventing costly repairs and downtime. 3. Assess LAN circuits in home or office environments to ensure network reliability and performance.