Invented by a practicing architect, the AlumiDrafter architects scale ruler provides the user all the advantages of a traditional triangular scale in addition to many other features, while solving the portability problem of its bulkier counterpart. Four tools in one! Measure and scale drawings, draw circles and arcs, draw angles and triangles, or use as a cutting edge. Standard architect graduations include: 16, 1/8, 1/4, 1-1/2, 3, 1/16, 3/32, 3/16, 1/2, 1, 3/4, 3/8, 1/32. Great tool for professional architects, architectural students, drafters.