Air gages work well due to three main reasons: they are body-piloting type, use dual-opposing sensor method, and have a noncontact sensing component. These features are present in most air gage designs, including ID/OD air probe, air ring, and air length gages.

When do you need to be concerned about the effects of temperature in your inspection process, how significant is it and how do you deal with it? These can be tricky questions to answer. 

“Never before have mechanics and manufacturers, and in general has the world of industry, made use of gages and gaging systems as it is doing now..."

In the quality world, air gaging ranks with micrometers, calipers, comparators, scales, CMMs and many other instruments in that they are all considered measurement and test equipment (M&TE).