Compression gauge

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A compression gauge or compression tester is a tool inserted into the spark plug hole on an engine while the flywheel is rotated. This will result in a pressure reading that can be used to judge the condition of a cylinder, piston, and rings. For a discussion on the ill-effects of certain compression testers being used on small displacement engines, http://www.mopedarmy.com/forums/read.php?7,2817203.

Generic comp tester.