Gauge - What does gauge mean?

Answer:

A standard unit of measure. A gauge is a unit of length measuring one-hundredth of a mil or one-hundred-thousandth of an inch (0.00001). 1 gauge is equivalent to 0.000254mm or 0.254μm (microns). This unit is most commonly used to describe the caliper (thickness) of thin plastics or metals; in labelling, it can be used to indicate the caliper of sheets of labels and the face and backing materials used to make label products.