Architect 6" traditional triangular pocket scale with clip is made from high quality extruded aluminum with ultra smooth edges and is about the size of a ball point pen. Calibrations are 16, (1/8, 1/4), (1/2, 1), (3/8, 3/4) and (3, 1 1/2) . This handy scale is an accurate and functional tool for art, drawing, drafting and architecture that will be treasured and used for many years.