Forty or 50 years ago, when you sat down in front of, or picked up, a dimensional measurement tool, you immediately recognized that a certain amount of knowledge and skill was required to use it. The measurement operation was almost always completely manual, and even reading and interpreting the readings was an acquired skill. In addition, it was largely understood that precise measurements needed to be taken in a controlled environment on a stable surface. A skilled measurement specialist was half engineer, half craftsman (or half Houdini).
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