Height gages are capable of performing a variety of external measurements on small, hand-sized parts, with quick changeovers. This model is shown equipped with an integral digital-readout device. Add to this the fact that changeover to a new part can be accomplished very quickly, and it becomes easy to see why the height gage still occupies a prominent place in the metrology toolbox.
Height gages come in a wide array of types and sizes.
The following discussion, however, applies to the vast majority of height gages in use today. The height gage is operated in a vertical plane. Components consist of a base plate or reference stand, a stanchion, and a comparator. The base plate supports both the stanchion and comparator, and serves as the reference surface upon which to place the workpiece to be measured. Base plates typically are made from either hardened steel or granite.