12" triangular scale in Staedtler's student series is ideal for students of architecture. Three sides with six different scales feature die-engraved graduations. Easy-to-read printed graduations will not rub off. Architect triangular scale is open divided: 3/32", 1/8", 3/16", 1/4", 3/8", 1/2", 3/4", 1", 1-1/2", 3" = 1'. Measurements are fully divided in inches to 16ths. Triangular scale is made of high-impact polystyrene plastic.