Master squares are ideal for inspecting the X, Y and Z axes of machine tools. This product is very stable and rigid, providing the ultimate in squareness references. Our master squares have five finished faces (one large face and four edges) finished flat, square and parallel to either laboratory grade AA (.000025” per 6”) or inspection grade A (.000050” per 6”). All six faces can be finished upon request.
Starrett Tru Stone - Five-Face Granite Master Squares
