new-chartpak 235e - triangular scale plastic 12 engineering color-coded - cha235e
precision-edged for accurate measuring . open face number design is easily legible . made of durable laminated plastic . packed in reusable plastic case . color coded 10 20 30 40 50 60 . ruler type triangular scale length 12 in standard scale 10 in 20 in 30 in 40 in 50 in 60 in metric scale n a. art amp drafting chartpak drafting supplies drafting drawing engineering architecture ruler rulers amp scales scale straightedge triangular triangular scale triangular scales measurements tools mathematics schools education teachers students length measuring device