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Return to Parts List Category : N- Tools & Books PFM 67597 VALVE SPRING PRESSURE TESTER ON ENGINE TESTER. GOOD FOR UP TO 600# $271.99 On Engine Tester. Good For Up To 600# Need to check spring pressure at the track? No problem with the stud (Magnum ) style valve spring compressor. This fully adjustable tool fits easily onto your rocker arm for pressure checks and will measure pressure up to 600 lbs.