Durable Aluminum Alloy Construction: Crafted from anodized aluminum alloy, this engineering triangular ruler ensures long-lasting durability and reliability for architects, engineers, draftsmen, and students alike. Precision Lasers Etched Scales: The ruler features lasers etching technology that prevents scale numbers and markings from fading or wearing off over time, providing maximum clarity and readability for precise measurements and drawings. Protective Storage Box: Designed for convenience and protection, the included storage box keeps the ruler safe from damage while ensuring easy storage when not in use, making it ideal for on-the-go professionals and students. Wear-Resistant and Anti-Corrosive: With a clear scale that is wear-resistant, anti-corrosive, and anti-rust, this engineering ruler maintains its accuracy and quality even after prolonged use in various working environments. Versatile Applications: Whether used in architectural design, engineering projects, drafting tasks, or educational settings, this engineering scale offers a reliable structure and extremely high precision to meet diverse professional and academic needs. Item Name: Engineering Scale Material: Aluminum Alloy Specifications: Large And Small Proportions Features: Sturdy Construction, Protective Storage Box, Wear-Resistant Size Details: A, L: 17cm/6.69", W: 1.7cm/0.67" (Approx.) B, L: 31.2cm/12.28", W: 2.4cm/0.94" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Engineering Scale