Inside Micrometer Calipers (Fig. 2.122) (Metrology)

2.38.
This micrometer caliper has no U-shape frame and spindle. The measuring tips are
constituted by the jaws with contact surfaces which are hardened and ground to a radius. One of
the jaws is held stationary at the end and second one moves by the movement of thimble. A locknut
is provided to check the movement of the movable jaw. This facilitates the inspection of small
internal dimensions.

Fig. 2.122. Inside micrometer caliper.
This is not widely used as other types have various advantages over it. Its range is from 5
to 50 mm.