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What are the chances that one of these actually gives repeatable results?
Surprisingly good. It's just a spring and a dial gauge. The former is either broken or working, and as it turns out, for the most part, so is the latter; tests on cheap digital measuring instruments show pretty good accuracy and precision, even when they are carried out by snobs who are trying to justify buying a Mitutoyo
gbj_tester
Hovis
What are the chances that one of these actually gives repeatable results? I am tempt