A height gauge is a measuring device used either for determining the height of something or for the repetitious marking of items.Height gauge, also called Vernier height gauge, is a widely used benchtop tool.The figure below shows the details and working arrangement of a Vernier height gauge. The pointer is sharpened to allow it to act as a scriber and assist in marking on workpieces. A Vernier height gauge is a measuring device used either for determining the height of something or for the repetitive marking of items to be worked on. Vernier height gauge is similar to vernier caliper but in this instrument, the graduated bar is held in a vertical position and it is used in conjunction with a surface plate.