- LED Work Indicator: Easily monitor power status with the built-in LED indicator. The green light shows positive polarity, while the red light indicates negative polarity, ensuring accurate readings during your electrical diagnostics. - Durable Steel Probe & Alligator Clip: Featuring a robust steel probe designed for piercing wire insulation, this circuit tester is built for reliability. The large alligator clip allows for convenient one-handed operation, making it easy to reach tight spaces. - Versatile Circuit Testing: This circuit tester is perfect for diagnosing various vehicle electrical systems. Quickly check automotive headlights, taillights, turn signal circuits, faulty sockets, and fuse connections, saving you time and effort. - Wide Compatibility: Designed for use with a range of vehicles, this professional tool works seamlessly with passenger cars, RVs, trailers, motorcycles, trucks, and other low-voltage systems, making it an essential addition to your toolkit. Use Cases: 1. Diagnose a faulty taillight in your car by connecting the tester to the circuit and identifying the issue with the LED indicators. 2. Inspect the wiring of your RV’s electrical system, ensuring all connections are functioning correctly with the steel probe and alligator clip. 3. Troubleshoot a motorcycle’s turn signals, allowing for quick repairs and enhanced safety on the road.