Height gauges are measuring instruments used to measure the height or depth of an object or surface. They usually consist of a fixed frame on which a movable measuring rod is mounted. The measuring rod can be moved up or down and the position of the rod is detected by an electronic sensor and shown on a digital display. There are different types of height gauges, such as inside gauges, outside gauges and depth gauges. They are widely used in manufacturing, quality control and engineering industries. Probing instruments with electronic digital display are used to measure the size and shape of objects. They usually consist of a probe head that is pressed onto the surface to be measured and an electronic sensor that senses the position of the probe head and displays it on a digital display. Scanners are used in a variety of industries, including manufacturing, automotive, aerospace and medical. They can be used to measure lengths, diameters, depths and other dimensions.