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The least count of the main scale of ver...

The least count of the main scale of vernier callipers is 1 mm. Its vernier scale is divided into 10 divisions and coincide with 9 division of the main scale. When jaws are touching each other, the `7^(th)` division of main scale and zero of main scale. When this vernier is used to measure lenght of a cylinder the zero of the vernier scales between 3.1 cm and 3.2 cm and `4^(th)` VSD coincider with a main scale division . The lehgth of the cylinder is : (VSD is vernier scale division)

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