This device is used to measure length of some blocks. It consists of a metallic scale with a jaw fixed at right angles to it at one end. Another jaw which is movable carrying a vernier scale slides over the metallic scale. One precaution is that the inner surfaces of the jaws are plane. When both the jaws are presses together, the zero of the vernier should coincide with the zero of the main scale. If it is not coinciding, zero error exists. Then we have to incorporate zero correction term. The least count of the vernier is the smallest length that can be measured accurately with it.
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