Inline Spark Plug Tester, Straight Boot Engine Ignition Tester Light Easy to Use, Small Armature Diagnostic Detector Tool for Automotive, Car, Lawnmower, Motorcycles, Internal External Engine

Good value. I only used it once so far to verify that the ignition and plug were good, but it worked well. Easier than unscrewing the plug. I did reverse the bulb so I could see it a little better and be sure to view it out of direct sun.

Worked great. Definitely helped to deter main the problem

Works, but need to test in a dark space as I could not see light flash outdoors.

This inline spark plug tester is a total game-changer for diagnosing ignition problems. It’s simple to use—just plug it in between the spark plug and the ignition wire, and you can instantly see if the spark is firing correctly. The visual indicator is clear and easy to read, making troubleshooting fast and stress-free. It’s a great tool to have, whether you’re a professional mechanic or a DIYer working on small engines, cars, or lawn equipment. For the price and functionality, you really can’t beat it. Highly recommend!

Good for checking for spark. The light flickers .

End for spark plug fell off first use but still is useable

Good

It does exactly what was expected of it.