principles of vernier
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It is an instrument which measures you thickness of something! There is no such thing as principle
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Vernier calipers are a tool from the caliper family allowing users to measure the inner or outer dimensions of items, and step or hole depths. Created by Pierre Vernier, a French mathematician, properly-calibrated vernier calipers hold a high degree of precision, able to measure tolerances in 0.05mm or 0.002 inches of accuracy. Vernier calipers have four distinct ways to measure distances.
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