Abstract: The included angle between two flat relatively angularly disposed surfaces of a workpiece is measured with the aid of a transfer gage having a base pivotally mounting, on a pivot axis parallel to a surface of the base, a transfer gage member, such as a transfer plate, with a work engaging edge means and a gaging edge disposed in planes parallel to the pivot axis and in precise known angular relationship to one another. The workpiece and transfer gage are placed on a flat supporting surface, such as a precision surface plate, with one surface of the workpiece and the base surface of the gage resting on the supporting surface and with the work engaging edge means of the transfer gage member seating flat against the other workpiece surface, whereby the angle of the gaging edge of the gage member relative to the supporting surface bears a known relation to the included angle between the workpiece surfaces.