Great for the students or the graphic professional. Anodized aluminum with permanent calibrations that will not clean off. Calibrations include inches, picas (with standard newspaper column widths), type point sizes and ruler widths.
Metal Ruler: This straight edge 18 inch ruler is useful as a precise measurement tool and guide; Features thermo-bonded graduations in 1/8 inch and
Mayes 10187 18 Inch Aluminum Ruler, Lightweight Straight Edge Ruler for Construction, Architecture, Drawing, and Engineering, Accurate and Straight
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L Shape Square 500mm 18 inch Metric Double Scale Aluminum Right Angle Ruler Measuring Layout Tool with Level Bubble | Harfington
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PRO ART 18-Inch Aluminum Straight Edge : Tools & Home Improvement