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Caliper is a device for measuring distances. The Vernier Caliper consists of two main parts. The fixed portion is the basic scale (in millimeters and inches) and an index with a vernier is on the sliding part. The scale has two pairs of jaws for measuring ‒ larger for outer dimensions, smaller taper jaws for internal dimensions (e.g., of holes), and extendable depth probe at the lower end of the caliper. Retainer on the sliding section is for release and locking. The Vernier scale allows measurements with an accuracy of 0.1 mm.
