What is vernier callipers and screw gauge?
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Micrometer Screw gauge Vernier caliper
It has a screw to measure so that it is called a Screw gauge. It is invented by Perri vernier and has calipers to kept so that it is called Vernier caliper.
It has a circular scale. It has a vernier scale.
It rotates to measure the objects. It slides to measure the length.
It measures the thickness and diameter of a very small object just externally. It measures the thickness, depth, external and internal diameter of the object.
Its usual least count is 0.001 cm. Its usual least count is 0.01 cm.
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