FWIW: Although they are good for finding an obvious problem like very low or no compression in a cylinder, I'm not a big fan of compression checks alone for engine health. From a useful information point of view, the compression check provides maybe 1/4 of the info you need and a LEAKDOWN test provides 3/4. Heck, you can pretty accurately tell an engine's condition with only a leakdown but you can't do that with only a compression check. Of course, the compression check should come first because if it shows one or more bad cyls, the engine has to come apart anyway and there's no reason to bother with the leakdown at that point.

Compression test can be misleading because carbon buildup on the piston/combustion chamber/valves can cause a compression reading to be even higher than specs. This makes one think that the engine is in REALLY good shape when actually it is not. A leakdown test will give you an accurate picture of what's really going on.

A search of "leakdown test" will find tons of articles describing the equipment/procedures. It takes a lot longer than a compression test and some additional equipment.