The main elements of the Vernier caliper are the

Main Scale marked in inches and fractions :

Vernier scale gives interpolated measurements to 0.1 mm or better
Vernier scale gives interpolated measurements in fraction of an inch
Thumbscrew is located at the bottom of the vernier scale.
Lock screw is used to fix the position of the jaws once the object is positioned.
Depth Bar can be used to measure the depths of holes or steps.
Outside jaws used to measure external diameter or width of an object.
Inside jaws used to measure internal diameter of an object.
Thumb grip used to block movable part to allow the easy transferring of a measurement.

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