So a quality used compression tester should be obtainable, buy from vendors who offer returns, DO NOT BUY FROM PEOPLE WHO REFUSE TO ACCEPT RETURNS, PERIOD.

I've gotten a lot of used quality tools for cheap.

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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.