How to find the least count of vernier calliper and screw gauge.
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Least count of vernier calipers
=Value of 1 main scale div / total vernier scale div
Least count of screw gauge=pitch / total no of div in head scale
pitch = (distance move along the pitch scale when a fixed no of rotations are given to head scale) / no of rotations
[if 10 rotations are given to the head scale ,and then S distance is moved along the head scale;then;
pitch of the screw=p=S/10]
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