Heavy Duty Precision This large protractor for teachers is built for durable use. It features a hard, wear-resistant ABS construction that preserves its shape and resists damage from frequent handling, making it reusable over time. Scratch-Free Handling Burr-free edges, rounded corners, and a smooth surface reduce the risk of cuts or scratches during use, keeping hands safe. User Friendly Lightweight and easy to handle, it supports effortless classroom demonstrations and comfortable operation for educators. Effortless Calculation A large digital display provides clear numbers for accurate angle readings and geometry calculations. 2-3 practical use scenarios - In geometry and math lessons, use it for live angle measurements on diagrams, worksheets, or board demonstrations. - In drafting or design activities, quickly verify angles during projects to ensure accuracy. - In science or engineering demonstrations, measure and compare angles during experiments that require precise angle readings.