Question

What is vernier calliper​

Answer 1

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A vernier scale is a visual aid to take an accurate measurement reading between two graduation markings on a linear scale by using mechanical interpolation

Answer 2

Vernier calliper:

The Vernier Calliper is a precision instrument

that can be used to measure internal and external distances extremely

accurately. The example shown below is a manual calliper. Measurements are interpreted from the scale by the user.