What do you mean by the least count of a screw gauge?

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Solution

The distance moved by the tip of the screw for a rotation of one division on the head scale is called the least count of the Screw Gauge.

Least Count = $\frac{(P i t c h)}{(N o . o f d i v i s i o n s o n t h e h e a d s c a l e)}$

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What do you mean by zero error of a screw gauge ? How is it accounted for ?

The least count of a screw gauge can be decreased by:

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