• 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

  • Will the dt swiss calibration chart will apply do you think?

    Only if they have exactly copied the DT spring rate, which is less likely than their ability to source a usable dial gauge. You either trust their calibration, or you entertain us all by building a test stand to do your own calibration.

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