chartpak 235a - triangular scale plastic 12 architectural color-coded
precision-edged for accurate measuring . open face number design is easily legible . made of durable laminated plastic . packed in reusable plastic case . color coded 3 32 1 8 3 16 1 4 3 8 1 2 3 4 1 1 1 2 3 1 1 16 in . ruler type triangular scale length 12 in standard scale n a metric scale n a.