Units and Measurements Part 1

The least count of the main scale of a verniercallipers is 1 mm. Its vernier scale is divided into 10 divisions and coincide with 9 divisionsof the main scale. When jaws are touching each other, the 7th division of vernier scale coincideswith a division of main scale and the zero ofvernier scale is lying right side of the zero of main scale. When this vernier is used tomeasure length of a cylinder the zero of the vernier scale between 3.1 cm and 3.2 cm and 4th VSD coincides with a main scale division.
The length of the cylinder is : (VSD is vernier scale division)