Digital Circuit Tester Pen 3V–120V | Car Truck Voltage Probe

Digital Voltage Circuit Tester Pen — Fast, Easy Electrical Checks

Whether you're troubleshooting a blown fuse, verifying a switch, or tracing wiring on your car, truck, trailer, boat, or motorcycle, this Digital Voltage Circuit Tester Pen makes the job simple. With a wide operating range of 3V to 120V DC, it covers virtually every low-voltage automotive and marine electrical system. Just clip the alligator clamp to ground, touch the probe to the circuit, and let the bright LED indicator tell you instantly whether the circuit is live — no guesswork, no multimeter needed.

Made in Mainland China.

Key Features

• Wide Voltage Range: 3V–120V DC — suitable for cars, trucks, boats, motorcycles, trailers, and other low-voltage systems
• Instant LED Indicator: Light illuminates when a live circuit is detected — clear, at-a-glance results
• Long Reach Probe: 8.3 cm (3.3") probe tip reaches into tight connector housings and fuse boxes with ease
• Generous Lead Length: 96 cm (37.8") flexible wire with a 20A alligator clamp for secure grounding
• Compact & Lightweight: Pen body is 17.3 cm (6.8") long and weighs just 130 g — slips easily into a glove box or tool bag
• Durable Construction: Plastic body with carbon steel probe for lasting everyday use
• Versatile Use: Check circuits, fuses, switches, relays, sensors, and wiring harnesses on virtually any DC system

Specifications

How to Use

1. Attach the alligator clamp to a known ground point on the vehicle or system.
2. Touch the probe tip to the wire, terminal, fuse, or connector you want to test.
3. If the LED indicator lights up, the circuit is live and receiving voltage.
4. No light? The circuit is open, the fuse is blown, or there is no power present.

Great for Use With

Cars • Trucks • SUVs • Vans • Trailers • Boats • Motorcycles • ATVs • RVs • Low-Voltage DC Systems

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For safe electrical work practices in automotive and DIY settings, the U.S. Occupational Safety and Health Administration (OSHA) Electrical Safety Guidelines offer authoritative guidance on working safely with electrical systems.

Frequently Asked Questions

Q: What voltage range does this circuit tester pen support?

A: This digital voltage circuit tester pen supports a range of 3V to 120V DC, making it compatible with standard automotive, marine, motorcycle, and trailer electrical systems typically running at 6V, 12V, or 24V.

Q: How do I use the circuit tester pen on my car or truck?

A: Simply attach the 20A alligator clamp to a solid ground point (such as the vehicle's chassis or battery negative terminal), then touch the probe tip to the wire, fuse, terminal, or switch you want to test. If the LED indicator illuminates, the circuit has voltage present. If the light stays off, there is no power at that point.

Q: Can I use this tester on a boat or motorcycle?

A: Yes! The 3V–120V DC range and robust alligator clamp make this tester suitable for boats, motorcycles, ATVs, trailers, RVs, and any other DC low-voltage system within that range.

Q: Is this tester safe to use on AC household circuits?

A: No. This circuit tester pen is designed exclusively for DC systems up to 120V. It is not rated or designed for standard AC household mains wiring. Always use the appropriate, properly rated tool for AC electrical work.

Q: What does the LED indicator light tell me?

A: When the LED light turns on, it confirms that voltage is present at the tested point — meaning the circuit is live and carrying power. When the light remains off, there is no detected voltage, which can indicate an open circuit, blown fuse, bad connection, or no power supply at that location.