Auto Circuit Tester Probe Pen – DC 12V 24V LED Voltage Tester

Auto Circuit Tester Diagnostic Probe Pen – DC 12V & 24V

Take the guesswork out of automotive electrical diagnostics with this professional-grade Auto Circuit Tester Probe Pen. Designed for cars, trucks, and most 12V/24V DC vehicles, this compact test pen makes it fast and easy to check voltage, current, and resistance in any automotive circuit — so you can pinpoint electrical issues and get back on the road with confidence.

Key Features

• Dual Voltage Compatibility: Works seamlessly with both 12V and 24V DC systems, making it suitable for passenger cars, trucks, vans, and light commercial vehicles.
• LED Digital Voltage Display: A bright, easy-to-read LED display shows your readings clearly, even in low-light environments like under a hood or beneath a dashboard.
• Bidirectional Current & Voltage Testing: Ground the alligator clip to the negative terminal and probe the positive with the pen tip — the green LED illuminates. Reverse the setup to probe the negative terminal — the red LED activates. Instant visual polarity confirmation.
• Heavy-Duty ABS Shell: The high-hardness ABS insulated housing provides excellent durability and electrical safety. Premium-quality clamp body and screws ensure long-lasting use.
• Reinforced, Flexible Test Wire: Thickened test leads are flexible and easy to route into tight spaces. A spring-protected wire opening prevents sheath damage and maintains safe, reliable connections over time.
• Wide Compatibility: Suitable for diagnosing and troubleshooting the electrical systems of most automobiles, helping you efficiently identify faults and resolve issues safely.

Specifications

• Voltage Range: DC 12V / 24V
• Display: LED Digital
• Shell Material: High-hardness ABS
• Batteries Required: No
• Made in: Mainland China

What's in the Box

• 1× Car Circuit Tester Probe Pen

Learn More About Vehicle Electrical Safety

For guidance on safe automotive electrical system inspection and best practices, visit the OSHA Automotive Safety Resource. Proper testing tools like this probe pen are essential for safely diagnosing vehicle circuit issues.

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Frequently Asked Questions

Q: Is this auto circuit tester compatible with both 12V and 24V vehicles?

A: Yes! This circuit tester probe pen is fully compatible with DC 12V and 24V electrical systems, covering the vast majority of passenger cars, trucks, and light commercial vehicles.

Q: Do I need batteries to use this circuit tester pen?

A: No batteries are required. The tester draws power directly from the vehicle's electrical circuit being tested, so it's always ready to use straight out of the box.

Q: How do I read the polarity using the LED display?

A: It's simple — when the alligator clip is grounded to the negative terminal and the pen tip touches the positive terminal, the green LED lights up. When testing the negative terminal with the pen tip while the clip holds the positive, the red LED illuminates. This gives you instant, clear polarity feedback.

Q: Is this probe pen safe to use for non-professionals?

A: Yes. The high-hardness ABS insulated housing, spring-protected wire opening, and reinforced test leads are all designed with user safety in mind, making it accessible for both DIY enthusiasts and professional mechanics. Always follow standard electrical safety practices when working on vehicle circuits.