This is also a sort of vernier caliper, equipped with a special base block and other
attachments which make the instrument suitable for height measurements. Along with the sliding
jaw assembly, arrangement is provided to carry a removable clamp. The upper and lower surfaces
of the measuring jaws are parallel to the base, so that it can be used for measurements over or
under a surface. The vernier height gauge is mainly used
in the inspection of parts and layout work. With a scribing
attachment in place of measuring jaw, this can be used to
scribe lines at certain distance above surface. However dial
indicators can also be attached in the clamp and many
useful measurements made as it exactly gives the indica-
tion when the dial tip is just touching the surface. For all
these measurements, use of surface plates as datum sur-
face is very essential.