It tests spark plugs. I use it to confirm they are good before installing new ones and verify the old ones still work.
I didn't know this existed until I saw it in a video a few months ago. I was replacing the plugs in my 2015 4Runner with 230k miles. I thought the truck ran perfectly fine, except my mileage was tanking and I was low on power. You get reassurance for what you're putting back in! Variable RPM to know exactly where your plugs are failing.
Got this to test my can am spark plugs due to misfire. Definitely works to find out which plugs aren't strong/working correctly. Also fun to play with haha
I like that I can use it many many times,
I know if I take care will last longer
3 out of the 4 spark plugs in my old tractor were bad. Saved me a bunch from ordering a tune-up kit, plugging wires, and chasing a short that doesn't exist.
Easy to use. Good value!
