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caliper
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A metal caliper measures the diameter of a small bolt, with the caliper's dial and scale clearly visible against a blue gradient background.
Calipers
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barometer. Antique Barometer with readout. Technology measurement, mathematics, measure atmospheric pressure
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caliper

measurement instrument
Also known as: calliper
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Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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History

caliper, measuring instrument that consists of two adjustable legs or jaws for measuring the dimensions of material parts. The calipers on the right side of the have an adjusting screw and nut and are known as spring calipers, while those on the left are an illustration of firm-joint calipers, which are held in place by friction at the joint. Outside calipers measure thicknesses and outside diameters of objects; inside calipers measure hole diameters and distances...

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