Abstract: An inexpensive thickness gauge for measuring thickness through holes prepared for the installation of fasteners, or at an edge of sheet material to determine thickness of individual or stacked sheets for various purposes. The gauge is comprised of two major components constructed from thin sheet material which are so shaped and so move with respect to one another as to provide a novel device which provides magnified readings, durable construction, compactness, and direct reading in fastener grip dash numbers, wire gages, sheet metal gages, etc.