Micrometers are instruments for precision dimensional gaging consisting of a ground spindle and anvil mounted in a C-shaped steel frame.

Dimensional gages and instruments provide quantitative measurements of product or component dimensional and form attributes such as wall thickness, depth, height, length, inner diameter (ID), outer diameter (OD), taper or bore.

Calipers typically use a precise slide movement for inside, outside, depth or step measurements.

Depth gages are used to measure of the depth of holes, cavities, or other component features.

Height gages are used for measuring the height of components or product features.

Thread gages are dimensional instruments for measuring and/or verifying thread size, pitch or other parameters.

Bore and ID gages are designed for internal diameter dimensional measurement or assessment.