Gage

(1) The thickness of sheet or the diameter of wire. The various standards are arbitrary and differ with regard to ferrous and nonferrous products as well as sheet and wire. (2) An aid for visual inspection that enables an inspector to determine more reliably whether the size or contour of a formed part meets dimensional requirements. (3) A device used to position work in a die accurately. Another name for a checking fixture which is used to check parts.

Source: The OHIO State University