Vernier Height Gauge
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, see fig. 1.48. 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 piace 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 indication when the dial tip is just touching the surface. For all these measurements, use of surface plates as datum surface is very essential.