Solid anodized aluminum construction ensures durability and precision. Unlike rulers with printed graduations, this engineer's ruler features 100% laser-etched markings for long-lasting accuracy. Updated triangular design with chamfered edges for safety and comfort. Lightweight and durable, ideal for architects, engineers, designers, and students. Includes 6 commonly used metric scales: 1:20, 1:25, 1:50, 1:75, 1:100, 1:125. Scales are graduated in both directions for easy reading from left to right or right to left. Features three concave sides for a secure grip and precise measurements. Anti-rust, high-quality anodized aluminum with a sleek black finish. Measures approximately 30 cm (12 inches) and weighs 100 g. Easy to carry, store, and use for a variety of drafting and measuring tasks. A reliable, precision tool for professional and educational use.