This portable multipurpose roller ruler combines several drawing tools in one compact device, designed for accurate and efficient work in school settings. - All-in-one tool: serves as a parallel compass ruler to draw precise parallel lines and circles. - Protractor function: provides precise angle measurements for geometry and design tasks. - Dry wipe board compatibility: ideal for dry erase boards, enabling smooth, easy drawing and quick layout updates. - Multifunctional design: meets a range of drawing requirements with a single instrument, reducing the need for multiple tools. - Durability and portability: built for daily classroom use with a compact form that fits in a pencil case or bag. - Performance and reliability: supports accurate lines and angles, delivering dependable results in classroom and home drawing tasks. Use scenarios: - In geometry class for drawing parallel lines and measuring angles on diagrams. - On dry erase boards for fast planning and explaining concepts. - For school projects and posters, enabling neat, proportionate layouts with minimal setup.