Stephane said: "But = depending on how you measure those 2mm, say with a ruler, this = effectively means the true value lays somewhere between 1.7 mm and 2.3 = mm, because your ruler shows only graduations every 1 mm, ....." IMO, this is the problem with metric measurements, as opposed to 100's of an inch, (ie machinist's). Best Regards, Joe Garrett, RPT, (Oregon) Captain, Tool Police Squares Are I
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