A compact, professional 6–24V probe pen that quickly identifies circuit continuity and polarity so you can diagnose vehicle and low-voltage electrical problems faster and with confidence. Key benefits Instant visual feedback: Bright LED lights indicate a good circuit; green shows positive polarity and red shows negative polarity so you can read results at a glance. Reach and hold test points: Long probe plus a secure alligator clip lets you access hard-to-reach or moving test points and hold a reference connection without a second pair of hands. Direct contact through insulation: The steel probe easily pierces wire insulation for reliable contact with conductors without extensive stripping. Versatile troubleshooting: Designed to locate faults in many automotive systems and other low-voltage applications, reducing diagnosis time and guesswork. Features LED test light that illuminates brightly when the circuit is good. Polarity indicator lights: green = positive, red = negative. Steel probe for durable, precise piercing of wire insulation. Long probe plus alligator clip combination for extended reach and a stable ground or reference connection. Rated for 6–24V circuits suitable for automotive and other low-voltage systems. What it detects Idling/engine idle control circuits Ignition circuits Automatic gearbox control circuits Air conditioner electrical circuits Wiper motor and switch circuits Other low-voltage automobile circuits Compatibility and performance Intended for 6–24V systems: passenger cars, trailers, boats, motorcycles, and similar low-voltage systems Durable steel probe for repeated use; bright LEDs for clear indication under workshop or field conditions Probe and clip design helps maintain steady contact during testing, improving accuracy and efficiency Practical use scenarios Quick diagnosis on a car: Clip the alligator to ground, probe the ignition coil or sensor connector; LED and polarity colors show whether the circuit is live and its polarity. Trailer lighting check: Connect the clip to the trailer frame and probe individual lamp wires to confirm power, polarity, and continuity without removing connectors. Motorcycle electrical troubleshooting: Reach cramped wiring harnesses with the long probe and verify circuits such as ignition or lights while stationary or with the engine idling. Simple to use, durable in the workshop or on the road, and tailored for 6–24V diagnostics—this professional probe pen gives clear pass/fail and polarity information to speed up electrical troubleshooting.