$29.99 $19.99
This automotive circuit tester is equipped with a bright LED digital voltage display that delivers accurate and dependable readings. Compared with traditional LCD test lights, the LED screen remains clearly visible regardless of lighting conditions, ensuring easy reading in sunlight or low-light engine bays.

Featuring a highly elastic spring wire that extends up to 110 inches, this tester provides added reach and flexibility during inspections. The reinforced anti-bend tail wire helps maintain stable contact, while the oversized alligator clip allows safe and convenient one-handed operation.

The built-in dual-color LED indicator makes polarity identification simple. A red light signals positive polarity, while a green light indicates negative polarity. The clip can be attached to either terminal, allowing easy probing of the opposite side.

This upgraded circuit tester includes an integrated circuit board for improved durability and safety compared to standard test lights. The insulated housing offers a comfortable grip while reducing shock risk, and built-in line protection improves heat resistance and operational safety.

Designed for a wide range of automotive testing tasks, this circuit tester pen is suitable for diagnosing headlights, brake lights, turn signals, fuses, sockets, wiring faults, and loose connections. The sharp, extended probe easily accesses tight or hard-to-reach areas.

| Product Type | Automotive Circuit Tester Pen |
| Display | LED digital voltage screen |
| Wire Length | Up to 110 inches (extended) |
| Polarity Display | Red for positive / Green for negative |
| Safety Design | Built-in circuit board with insulation |
| Usage | Automotive electrical diagnostics |

1. Can the display be seen clearly in sunlight?
Yes. The LED digital display remains bright and readable in both outdoor and low-light conditions.
2. Does this tester show polarity direction?
Yes. Red indicates positive polarity, while green indicates negative polarity.
3. Is it suitable for modern vehicle electronics?
Yes. The integrated circuit board and protective design help ensure safe testing.
4. What systems can be tested?
It can be used to check lights, fuses, sockets, wiring faults, and other automotive electrical components.
This digital circuit tester pen is super accurate and easy to use — perfect for checking outlets and wires.
Love how fast it gives results! It helps me troubleshoot electrical problems without guesswork.
Very handy tool for both home and workshop. The digital readout makes everything clear.
Great quality and very sensitive — detects voltage quickly and reliably every time.
Excellent tester! I use it for car electrics and home wiring — works flawlessly.
Simple design but very effective. The display is easy to read even in low light.
Highly recommend this pen tester — accurate readings and solid build quality.
Very precise and quick response. Helped me find a faulty outlet in minutes!
This tester pen makes electrical troubleshooting so much easier. Definitely worth the purchase.
Great tool for DIYers! Easy to carry and very reliable for voltage detection.
The best circuit tester I’ve owned — strong performance and accurate readings.
Very happy with this tester — lightweight, intuitive, and works great on various circuits.
We stand by our product quality. If you are not pleased with your purchase, we offer a 7-day quality guarantee on all products. If you have any additional questions or would like to request return, refund, exchange, feel free to contact us at [email protected].
Learn more about our return, refund, and exchange policies here.
Order processing & shipping time within 3-5 days, and delivery time within 14-21 business days from shipping date. During high volume periods, the processing time may take an additional 2-4 business days . Learn more about shipping FAQs here.
On average, the shipping fee is $4.95 per unit. However, shipping fee may vary due to promotional activities. Please visit the checkout page to obtain your final shipping charges.