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Vernier calliper is an instrument used to measure length of a rod,inner as well as outer diameter of a hollow cylinder and depth of a vessel.Its least count is 0.01 mm.
Its important parts are-
Main scale
Vernier scale
Upper and lower jaws
Screw gauge is an instrument used to measure thinness of a paper,wire,etc;outer diameter of a sphere,or any other circular body etc.Its least count is 0.001 mm.
Its important parts are-
Circular scale
Main scale
Hope i helped u:)

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