what is the defination of the vernier callipers
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a measuring device that consists of a main scale with a fixed jaw and a sliding jaw with an attached vernier.
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.
Purpose: Measuring more precisely than could be done unaided when reading a uniformly divided straight or circular measurement scale
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