Multi-Function Rafter Square and Protractor - This tool combines the features of a rafter square and protractor for accurate angle measurement, layout marking, and vertical and horizontal readings, serving the needs of engineers and carpenters. - Aluminum Alloy Construction - Built with an aluminum alloy structure for durability and long-lasting performance in both engineering and woodworking projects. - Accurate Engraved Markings - Etched markings provide clear readability and precise measurements, helping to reduce errors. - Ergonomic Design - Comfortable grip and easy handling support efficient and precise measurements for improved workflow. Use scenarios - Roof framing and rafter layout: quickly measure, mark, and transfer angles for rafters and related framing components. - Woodworking and furniture making: lay out exact angles and reference lines for accurate cuts and joints. - On-site alignment and installation: verify perpendicularity and relative angles between components for proper fit and fitment.