





Stop Guessing and Start Fixing
Durable, simple, and built to last. This professional-grade tool allows you to instantly test both 4-pin and 5-pin relays with a single button, making it perfect for any skill level.

Test with Unwavering Confidence
The heavy-duty, insulated clamps bite down hard and won't let go, ensuring a perfect connection. This means you get an accurate, reliable reading the first time, every time.

The Choice for Faster, Accurate Repairs
Trusted by mechanics and DIYers alike, this tool dramatically increases diagnostic efficiency. It empowers you to find the problem fast and get your vehicle back on the road sooner.

Our 30-Day Risk-Free Guarantee
Your satisfaction is our promise. If you are not completely satisfied with your purchase, return it within 30 days for a full, no-questions-asked refund.
Quick Answers to Popular Questions
1. Do I need to be a professional mechanic to use this?
1. Do I need to be a professional mechanic to use this?
Absolutely not! We designed it with simplicity in mind. The straightforward clip-on system and simple one-button operation make it incredibly easy for anyone, from seasoned professionals to first-time DIYers, to diagnose relay issues accurately.
2. What is the difference between the 4-pin and 5-pin setting?
2. What is the difference between the 4-pin and 5-pin setting?
Automotive relays come in different configurations. 4-pin relays are typically simple on/off switches for things like horns or fans, while 5-pin relays have an extra connection that allows them to switch power between two different circuits. Our tester allows you to check both common types with the press of a button.
3. How is the tester powered? Do I need to buy batteries?
3. How is the tester powered? Do I need to buy batteries?
No extra batteries are needed. The tester is powered directly from your vehicle's 12V battery using the attached red and black insulated clips. This ensures it always has enough power to perform a reliable and accurate test.
4. What if the LED doesn't light up at all when I test a relay?
4. What if the LED doesn't light up at all when I test a relay?
If neither the red nor green light illuminates, it typically indicates one of two things: the relay is completely dead and unable to complete a circuit, or there is an issue with the connection to the car battery. First, ensure your clips have a solid, clean connection to the battery terminals.
5. Is this better than just using a multimeter and jumper wires?
5. Is this better than just using a multimeter and jumper wires?
For most users, yes. While a multimeter works, it requires knowledge of the relay's pinout and a multi-step process with jumper wires. Our tester simplifies this into a single, foolproof action, providing an instant and easy-to-read result without the complexity or risk of error.