Professional Triangular Scales Professional-quality scales made from high-impact plastic with white, non-reflecting, dull-matte faces and tapered edges. Machine-engraved graduations and color-coded furrows. Supplied in hard plastic case.Architect scales have the following graduations 3/32, 3/16,1/8, 1/4,1/2,3/8,3/4,1-1/2, 3" to the foot: one edge graduated to 16ths Engineers scales have the following graduations 10,20,30,40, 50, 60 parts to the inch