I’ve written many times about how air gauging allows you to measure many jobs faster, more conveniently, and more accurately than other gauging methods.

For measuring all hole conditions, air gauging is unsurpassed for speed and accuracy. When checking any dimensional characteristic, air gauging offers sufficient magnification and reliability to measure tolerances well beyond the scope of mechanical gauges.

Air gauges also measure all common types of dimensions effectively and are particularly suited to checking dimensional relationships. Some of these are taper, parallelism, squareness, straightness, and center distance. Match gauging, which permits the selection of mating parts with a specified amount of clearance or interference, is easily accomplished with just one reading on one dial.

One of the great things about air gauging is that virtually no other gauging system can put the sensors (in this case, the air jets) so close together to allow for multiple diameters or geometric conditions in very small pieces of tooling. But the fact that you can get the sensors close together to make checks for taper or squareness may also impose limits, despite the measuring capability.

 …