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- A measuring instrument used, for example, to
- measure the internal and external diameter of
- pipes. Some callipers are made like a pair of
- compasses, having two legs, often curved,
- pivoting about a screw at one end. The ends
- of the legs are placed in contact with the
- object to be measured, and the gap between
- the ends is then measured against a rule. The
- slide calliper looks like an adjustable
- spanner, and carries a scale for direct
- measuring, usually with a vernier scale for
- accuracy.
-