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why is vernier caliper regarded as less accurate than measurement taken in screw guage?

Both vernier calipers and screw gauge has a main scale and a micrometer scale reading. But screw gauge can be  used for dimensions smaller than those measured by vernier calipers.
*Least Count of Vernier Caliper is 0.02 mm.
*Least Count of screw gauge is 0.01 mm.
So screw gauge measurements provide more accuracy and precision.


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