
It seems to work fine. I'm not a professional mechanic and I don't use it every day. Also, this is my first time using a compression tester, so I don't have a comparison and can't speak about its accuracy. However, I have used it a few times on small engines and Chevy 305s. It was easy to use and comes with all the adapters needed. It seems to be working as it should and the spark tester is great.

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