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optical caliper

A device for measuring linear dimensions. The optical caliper generally consists of two circularly mounted mirrors whose angular positions are monitored by an autocollimator, and that are capable of independent angular rotation. Optical calipers are capable of measuring the diameter of screw threads, the dimensions of wires, and the length of gauge blocks, and other apertures on the scale of a mm. Microcalipers are used for measurements on the micron scale.
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