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Versatile design lets architects work with maximum efficiency. Change units by rotating dial at either end of scale without moving scale from work surface. 12" measuring length, 1/32" scale. Exact calibrations. Highest quality aluminum. Adjusts to 1/16, 1/8, 1/4, 1/2, 1:1 and 2:1. Ruler Type: Triangular Scales; Length: 12 in; Standard Scale: N/A; Metric Scale: N/A.