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The simplest solution is often the best. This old adage applies to almost anything, including dimensional inspection. In a room full of high-tech equipment like 3D scanners, coordinating measuring machines, and high-precision devices that can measure on a nano scale, sometimes the only thing you really need is a pair of calipers.

For some dimensional inspection applications, the best way to obtain measurements is by using a sensor that comes into contact with the object. Contact sensors work best when the object is rigid and not fragile. They are also often used when the surface of the object does not lend itself to light sensors because it is reflective or too dark.

Dimensional inspection can be performed with a wide variety of methods and equipment, depending on the object being measured. When selecting equipment, remember the cardinal rule of dimensional inspection: The object being measured cannot be altered during the measurement process.