black sunshine Posted February 23, 2009 Report Share Posted February 23, 2009 On the matco ones, I have had two that I know were of by 25-35 psi. I ended up getting my money back because every tester he gave me was reading too low. Used my buddies Matco to check my compression and it read 85psi both cyls. Sent it to FAST for a work over with 20cc domes which should have put me at 160psi. Matco tester then read 105psi! Bought a used Snap-On off ebay for $90 and it read 160psi both cyls. :thumbsup: Quote Link to comment Share on other sites More sharing options...
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