What is a digital height gauge ?

Digital height gauge is also called electronic height gauge.It is used to mark out lines when accuracy is particularly important. Digital height gauge has a large steel base for stability and a hardened steel column engraved with inch and mm units. The moving slide is engraved with vernier calibrations enabling settings to an accuracy of 0.02mm and 0.001''. Attach to the moving slide is a wedge-shaped steel scribe that has a pointed tungsten carbide tip. The height of the scribe's point can be finely adjusted with a thumbscrew.