Question

what is vernier callipers? why it is so called?​

Answer 1

A Vernier calliper is a slide calliper with a Vernier scale on it. That scale allows for much more resolution to be achieved in readings. The name comes from one Pierre Vernier

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Answer 2

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$\underline\bold{A\:vernier\: scale,}$ named after Pierre Vernier, is a visual aid to take an accurate measurement reading between two graduation markings on a linear scale by using mechanical interpolation; thereby increasing resolution and reducing measurement uncertainty by using vernier acuity to reduce human estimation error.

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