- Versatile Circuit Tester for 6V, 12V, and 24V DC Systems: This car circuit tester pen is expertly crafted to identify power, ground, shorts, and breaks in wiring across a range of DC systems, making it an essential tool for automotive diagnostics. - Broad Compatibility: Ideal for use in various vehicles including passenger cars, sedans, SUVs, RVs, and trucks. It effectively detects open circuits, blown fuses, and assists in tuning signal lights, headlights, and taillights. - Illuminated Handle for Easy Detection: The circuit tester features a bright handle that lights up when the circuit is functioning properly. The light intensity adjusts according to the voltage being tested, providing clear feedback on circuit status. - Extended Probe with Clip for Accessibility: Designed with a long probe and a convenient clip, this tester allows you to reach tight spaces effortlessly, ensuring you can perform diagnostics in hard-to-access areas. - Practical Use Cases: - Quickly diagnose a non-functioning headlight or taillight by checking for power supply issues. - Efficiently troubleshoot wiring problems in RVs or larger vehicles with complex electrical systems. - Test and replace faulty fuses to restore functionality to critical vehicle systems. This circuit tester pen combines functionality, ease of use, and broad application, making it a reliable choice for both professional mechanics and DIY enthusiasts.