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.