12" triangular scale in Staedtlers professional series is ideal for architects. Color-coded grooves in the high-impact polystyrene plastic ensure quick and accurate selection of the desired scale. Three sides with six different scales feature die-engraved graduations. 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. Easy-to-read printed graduations will not rub off.