Built to last: Unlike engineering rulers with printed markings, our engineering scale is made of solid anodized aluminum. 100% laser etched markings for absolute precision and accuracy. Quality and chamfered edges: Updated triangular scale with chamfered edges for added safety. Every design deserves the quality and precision that the triangular architect scale provides, offering a lightweight and durable feel for ease of use in any project. Constructed of high-grade anodized aluminum, this ruler is built to last. All-in-one scale: Metric scale ruler includes 6 of the most commonly used scales: 1:20, 1:25, 1:50, 1:75, 1:100, 1:125. Scales are clearly labeled for easy reading from left to right or right to left, eliminating guesswork. Wide application: 30cm in length, 100g in weight; lightweight and easy to carry and store. A practical measuring tool ideal for architects, draftsmen, and students. 100% satisfaction guaranteed: Our measuring tools come with a money-back guarantee. If you're not completely satisfied, simply for a full refund.