Air gauging has roots going back more than 70 years and is today a viable and highly reliable method for many industrial applications where a high volume of parts is produced, or where the precision of hard-to-access dimensions makes other measuring techniques impossible. This includes, in some cases, fast-growing laser technologies.

Air gauging is based on two simple principles of physics: That flow and pressure are directly proportional to clearance, and that they react inversely to each other. This means there is a fixed relationship between the object and the airflow, one that can be tracked quite precisely. The flexibility of air gauging means it can be used to measure flatness, roundness, squareness, taper, straightness, and matching between pairs of joined surfaces, on connector bodies, for example.

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