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Reply to "EDM for second measurement of a calibration course"

I agree with what you say Pete, but that's why I suggested using the EDM only for the second measurement. The second measurement is required primarily to make sure something wasn't done incorrectly on the first measurement. If an EDM measurement was within an inch or so of the 1st taped measurement, then you can be pretty confident both were done correctly. If it's not, then you'd need to do a second taped measurement.
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