What are go, no-go, and setting ring gages? A go ring gage is made with the high limit of the part tolerance as well as a unilateral minus tolerance. Used in direct gaging, a go ring gage tests whether a part is oversized and therefore will not go through the ring. A no-go ring gage is built with the low limit of the part tolerance as well as a unilateral plus tolerance. The no-go gage tests whether a part is undersized by seeing if it passes through the ring and is also used in direct methods of gaging. A setting ring gage, or a master ring, is made to be used in methods of indirect gaging and serves as a comparator for other instruments which will then be used to test parts.