Gauge block, (also known as a gage block, Johansson gauge, slip gauge, or Jo block)Ī precision ground and lapped length measuring standard. The wet film thickness will fall between the clearance of the shortest tab that is wet and the clearance of the next shortest dry tab.ĭial indicator, also known as a dial test indicator, dial gauge, or probe indicatorĪn instrument used to accurately measure small linear distances.Ī simple tool used to measure gap widths. For measuring the comb gage is pushed perpendicular into the film using the measuring range that corresponds to the expected film thickness. Used to gage internal dimensions of bores that are either too small in diameter for an inside micrometer, and have greater economy than a bore gage or other precision internal gage.Ī device used to measure the distance between two opposing sides of an object.Īre engineering gauges used in lathe work for checking the angles when grinding the profiles of single-point screw-cutting tool bits and centers coaxical centering gauges are used to center a rotary table against a drilling bit in drilling millsĪ ruler-shaped gage with two supports at each of its six sides, having tabs of varying lengths. Instead the screens display analogue meters. The flight instruments cannot display figures only, hence even in the most modern 'glass-cockpits' where almost all instruments are displayed at screens, few figures are visible. The ultimate example is cockpit instrumentation in aircraft. The other two types are only displaying digits, which are more complex for humans to read and interpret. An indicator or needle indicates the measurement on the gauge. The two basic types with an analogue display are usually easier for the human eyes and brain to interpret, especially if many instrument meters must be read simultaneously. Only numbers are displayed, but through a mechanical or electro-mechanical display (today very rare but has existed for clocks, certain Doppler meters and informational screens at many stations and airports) Analogue instrument meter with digital display.

Only numbers are shown at a digital display. Digital instrument meter with digital display.A screen that shows an 'analogue meter', commonly used in modern aircraft cockpits, and some hospital equipment etc. Digital instrument meter with analogue display.Until the later decades the most common basic type. Analogue instrument meter with analogue display ('needles').Basic types Īll gauges can be divided into four main types, independent of their actual use. Depending on usage, a gauge can be described as 'a device for measuring a physical quantity', for example 'to determine thickness, gap in space, diameter of materials, or pressure of flow', or 'a device that displays the measurement of a monitored system by the use of a needle or pointer that moves along a calibrated scale'.

A wide variety of tools exist which serve such functions, ranging from simple pieces of material against which sizes can be measured to complex pieces of machinery. Device used to make and display measurementsĪ gauge, in science and engineering, is a device used to make measurements or to display certain dimensional information.

Pipe master contour gauge