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This 3-in-1 automotive power circuit probe and relay tester combines circuit testing, component activation, and relay diagnostics in one tool. It provides real-time DC voltage readings on a backlit LCD, with red and green indicators for positive and negative polarity, helping you quickly identify power and ground without repeated range changes.
Use the probe to apply positive or negative battery power to test compatible lights, motors, fans, and other DC components, helping you distinguish wiring problems from component failures. The integrated relay testing area checks selected common 4-pin and 5-pin automotive relays, detecting coil operation, abnormal engagement, and faulty contacts.
Dual LEDs near the probe tip illuminate wires and connectors in dark, tight spaces. It is compatible with 12V and 24V DC vehicle systems, with a voltage range of DC 3.5–36V and rated current of 1–8A. Package includes the tester, long power cable, red and black battery clamps, probe tip, and user manual. For compatible DC automotive systems only; do not connect to household AC voltage.
Reviews imported from our previous store / verified customer feedback
Honestly, this 3-in-1 probe is a lifesaver in the garage. My husband uses it all the time for diagnosing car issues. It handles 12V and 24V systems perfectly, which is super convenient. No need to grab multiple tools.
I was a bit skeptical about a multi-tool, but this circuit probe and relay tester works great. We've used it on a few different vehicles, including a 36V setup, and it's held up really well. Definitely saves space and time compared to separate testers.
This tester makes quick work of diagnosing electrical problems. Pinpointing bad relays is super easy now. The display is clear, and it feels sturdy. My garage buddies were impressed with how quickly I found a short. Highly recommend for any home mechanic.
