Alvin - Triangular Engineering Scale Plastic 12"

All engineer scales have the following graduations unless otherwise noted: 10, 20, 30, 40, 50, 60 parts to the inch. Easy to Use - Sharp, easy-to-read graduations resist wear, includes both English and metric measurements: Multipurpose Scale - Designed for architect, engineer, and mechanical draftsman graduations. Great for students, hobbyists, and professionals alike. Durable, Premium Material - Made with a soft, satin finish from high-impact plastic. Edges are tapered for comfort and ease of use. Precision Design - Designed for accurate and reliable measurements and consistently straight edges to make every project easy and accurate.