Explain, in detail the construction and working of a vernier calipers.

Vernier calipers are precision measuring instruments used to measure distances with a high degree of accuracy. They consist of a main scale and a sliding vernier scale, which enables the measurement of dimensions with precision down to a fraction of a millimeter. Vernier calipers are commonly used in fields such as engineering, physics, and metrology due to their accuracy and versatility.

Construction:
1. Main Scale: The main scale of a vernier caliper is a graduated scale typically marked in millimeters or inches. It is a long, straight bar with a fixed jaw at one end and a movable jaw at the other _______ ____ _______ ____ ____ __________ __________ ____ __________.
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