My Snap-On Dealer has a tester on the truck. He can test them, but not do calibrations. If fit tests out of range, he can send them in. My 1/2" was 5 lbs off at 100 and right on at 150, so I didnt worry about it.
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize.
1977 Trans Am W72 400, TH350, 3.23 T Top
Everyone you will ever meet knows something you don't.
Bill Nye.
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