Precision 90 Degree Angle Measurement Achieve absolute accuracy in every project with this Lshaped square ruler, engineered from carbon steel using advanced integrated molding technology. With a maximum 90degree angle error of just 0.05 mm, it ensures reliable vertical alignment for professional woodworking, metalworking, and precision fabrication tasks. DualFunction Design for Measuring and Marking Save time and eliminate tool changes with a ruler that doubles as a scribing guide plate. Perform corner measurements and marking in a single step, streamlining workflows for increased efficiency in projects that require exact lines and angles. UltraDurable 3 mm Carbon Steel Construction Built from solid 3 mm thick carbon steel, this ruler is resistant to wear, impact, and deformation. Its sturdy build delivers consistent performance even in demanding workshop environments, ensuring longevity in daily professional or hobbyist use. Versatile Applications for Multiple Trades An essential tool for carpenters, metal fabricators, and decorators. Ideal for tasks such as calibrating lathe workpieces, creating precise joints in wood, or ensuring accurate measurements in metal component assembly. Suitable for both largescale professional projects and detailed DIY work. Ergonomic and UserFriendly Design Designed for comfortable handling and ease of use during extended tasks. The ruler's balanced weight and refined edges allow for stable positioning and smooth operation, reducing fatigue and improving accuracy in repetitive measuring and marking activities. Key Benefits Precision measurement with minimal angle error for results Dualpurpose functionality reduces setup time and tool changes Heavyduty carbon steel build resists damage and ensures long service life Compatible with woodworking, metalworking, and decorative crafts Practical for professional trades and home workshops alike Examples of Use 1. Aligning and marking accurate right angles for cabinet construction in carpentry. 2. Measuring and scribing metal plates before welding or machining. 3. Calibrating lathe workpieces to exact specifications for flawless mechanical components.