AUTOOL Car Spark Plug Tester and Analyzer, 110V with Protective Cover and Double Hole 12MM Socket, Yellow

I ordered this item but I received only shell.You all should check item before packing.I disappoint this brand.

The AUTOOL Car Spark Plug Tester is an absolute game-changer for diagnosing ignition issues. I used it to test several plugs from different vehicles, and it worked flawlessly every time. The dual-hole feature is super convenient—it lets you compare two plugs side by side, which really speeds up the process. It’s simple to operate, well-built, and surprisingly powerful. The adjustable frequency is a nice touch, allowing you to simulate different engine speeds and get a clear look at spark strength and consistency. Whether you're a professional mechanic or a DIY enthusiast, this tool is worth every penny. It’s saved me time, money, and frustration.

This thing is great had a motorcycle that would randomly drop a cylinder coil tested good injectors tested good pulled the plugs from the rear cylinder and one of them would just stop working when it got warm . Great for a visual on something you would never see .

I run a motorcycle shop, and I've always just had to use the ignition system of the bike I'm working on to test a plug. If a customer questions a plug I've replaced, it's really lame to do that kind of test as proof. This unit is amazing. I can test either one or two plugs at a time in either socket. I LOVE that kind of versatility. I find that a fouled plug will show its short on the lowest setting of this unit. The faster/stronger the spark, and the longer it sparks, will help the plug to spark in that same spot each time, so the foul condition appears less. Therefore, when testing a plug for foul/short/cracked ceramic/etc, always keep it on the lowest setting for the shortest time possible. A plug should never spark outside of its gap, so if a plug is observed to send a rando lightning anywhere else a single one time, that's all that's needed to condemn the plug. Then, I can prove(if needed) why the plug's bad using this fancy unit that tucks away so neatly! The power block completely fits into the clear cover, too. That might have been my favorite part! The manual is as simple as the unit, and also as complete as it could be. The quality of the packaging, manual, and certificate of conformity card is as impressive as the stringent quality control they put these units through(HIGH). Overall, I'm so very happy with this, especially at this price. 100% all around. I don't get to say that very often.

I bought this tester but mostly test small engine plugs, so I needed to modify it (Not much difficulty) to handle small engine spark plugs. Now I have a tester that does both.

Works well.