Best Ignition Testers of 2026

"As a mechanic, I find this tester to be essential for checking spark plugs. It's straightforward and works as intended, making diagnostics much simpler for engines with accessible plugs."

"I appreciate how simple and durable the SINGARO Inline Spark Plug Tester is. It's a breeze to use and feels solid. However, the bulky light area does limit its use in tight engine compartments, so it's best for lawnmowers and similar equipment."

"Unfortunately, my experience was disappointing. Despite following the instructions, I couldn't get the tester to work on any of my vehicles. The bulb seemed off-center and the build felt cheap. I wouldn't recommend it unless the design gets improved."

"I’m very impressed with the Ram-Pro InLine Spark Tester’s versatility and reliability. It’s easy to use, works with a range of engines, and quickly helps me diagnose ignition problems in my car and lawnmower. The clear indicator makes troubleshooting simple and the build quality feels solid. Definitely a must-have tool for DIY and professional mechanics."

"This spark tester helped me pinpoint a misfire in my V-twin lawn tractor after I’d already replaced the fuel system and spark plugs. Super simple to use—just connect it inline and watch for the signal. I found the problem cylinder right away and a coil change fixed it. Great price and quality—highly recommended!"

"The product does exactly what it’s supposed to: lets me easily check if my spark plugs are firing. My only wish is that the cable was a bit longer, since it can be tricky to hook up in tight spots. Otherwise, it works very well and connects easily."

"Using this spark plug tester has made diagnosing ignition issues so much simpler for me. The clear visual indicator and straightforward setup take the guesswork out of troubleshooting. For the price, I think it's an essential tool in my workshop."

"I got this for my husband and he found it super easy to use and reliable. It quickly helped him pinpoint which spark plug was misfiring, and he's impressed with how solid and effective it is."

"In my experience, the tester works well on electric start engines, but not on pull start ones. For my electric start equipment, it performed just as expected. However, it's a bit tricky to see the indicator if you're working in direct sunlight."

"I appreciate how inexpensive yet effective this spark detector is. It's made troubleshooting small engines much easier for me."

"The indicator light is bright and easy to see, which is really helpful when working on my lawnmower or other two cycle engines."

"Although the fit and finish could be better, the tool itself works well for my needs and is super handy."

"Even though there was a two-week shipping delay due to USPS and not the seller, the product itself was exactly as described."

"I chose this one because the light is actually visible during broad daylight, which is much better than the other smaller pink version I tried. If you need something that works outside of sunset hours, this is the one to go with."

"I tried using it on my ignition coils to find a misfire, but it didn’t detect anything while the car was running. The light never came on for me."

"This tool has been a real help, as it takes away a lot of the guesswork and makes diagnosing much simpler. It’s definitely something I’m glad to have in my garage."

"I picked this product mainly for the reasonable price and ease of use. While there were no instructions in the box, I found a helpful video on their website. Just a heads up, the batteries don’t fit super tight, so handle with care. Otherwise, it did a great job identifying bad coils and spark plugs on my vehicle."

"I used this tester on all my personal cars and it worked perfectly, even for an old dirt bike’s single cylinder ignition. It’s a handy product that simplifies troubleshooting. Just remember to take out the battery before storing to avoid leaks. In the future, I’d love to see a version with a CR battery to avoid the usual battery issues."

"As someone who fixes small engines regularly, I found this tester to be inexpensive and highly effective. It lets me check for spark in seconds—no extra tools needed. Honestly, I wish I had gotten it much sooner."

"I was troubleshooting my lawn mower's starting issue and suspected a spark problem. This product helped me quickly confirm the coil was fine but spark was missing, which saved me a lot of time."

"The light is clearly visible and the tester works well for checking coils on small engines. The only minor issue is the boot is almost too long for shorter spark plugs, so I had to hold it in place. Nevertheless, it gets the job done."

"Before I started using this tool, I was never really sure if a repair shop was being upfront with me. Now, I can easily test coils myself and know exactly what's going on. The visual and audio feedback is straightforward, and it couldn't be simpler to operate. It's definitely saved me money and boosted my confidence in handling basic diagnostics."

"As a semi-retired tech with loads of diagnostic gear, I picked up this OBDEMOTO tester for those times I just need a fast, hassle-free check. It’s well-built, portable, and works on everything from cars to motorcycles. The instructions are straightforward, and I love how easy it is to store. While it may not catch every issue, it’s a solid value for quick tests."

"I added this to my toolbox just in case and decided to try it out on our ‘69 Nova during engine work. I showed my son how it works and we discovered one cylinder wasn't firing consistently. Cleaning the distributor cap fixed it, and the tool confirmed the engine was smoother and firing on all cylinders. It works great and helped us solve a persistent problem."

"As a solo mechanic, I found this tester to be incredibly useful and easy to use. It made confirming that my spark plug wires were delivering power a breeze, even when working alone. The spark is clearly visible during cranking, and the build quality feels solid. It’s now an indispensable part of my diagnostic toolkit."

"This tool is well made and highly functional. It really simplifies diagnosing ignition issues and has helped me test several small engines and motorcycles already. I’m glad I picked it up instead of trying to make my own tester again."

"I used this tester on my lawnmower and it was super straightforward. Just plug in the wire, clamp it, and pull the engine over—the spark was easy to see and it saved me a lot of time troubleshooting the ignition."