ATP Compression Tester Automotive Tool Professional Engine Cylinder Compression Tester Kit

I used it to test compression in 3 old 2 stroke outboards and I trust it gave me accurate readings although I wasn’t able to compare results with a expensive gauge but I feel like it does the job and the storage case is a nice plus

Great value. Has different adapters and can be use on lawn equipment chainsaw ECT.

Quality product very fast delivery

Used it twice and now cable is loose in compression gauge and won't work

For the price this is a great compression gauge. Comes with everything needed for most engines.

Kit is great and would be amazing but psi cant trust. When it comes to something this important to test the internals of an engine you cant even be off technically 10psi or could show signs of blown top end or bottom alot depends on this psi reading.

A necessary tool for small engine Diagnosis

This tools one purpose is to detect pressure, hopefully somewhat accurately. After replacing a head gasket I wanted to validate compression. When testing with the tool it seemed to only get up to 110 PSI, which didn't meet my spec and made me think I had a problem with the work I had done. I suspected maybe the tool malfunctioned and went back and read other reviews and sure enough other people had issues also. The gauge that was shipped to me seemed like it was only good up to about 110 PSI and nothing over. When I went and bought another gauge it appears this tool was off by at least 50 PSI or that it could not exceed the 110 PSI. I ended up returning.