Versatile angle measurement: the digital protractor can measure internal and external angles, with angle differences up to 200 degrees. It has a precision of up to 0.5 degrees for accurate field measurements. Multifunctional design: measures angles and lengths with a single tool. It can also convert between units, and the ruler edge supports both metric and inch units. Effortless utility: capture precise angle measurements easily. The locking angle function holds the angle, and measurements can be retained after power off. Longpress the button to retrieve accurate results. Unmatched longevity: built with durable materials and an advanced design for over 2000 hours of continuous use, and has an automatic shutdown function to minimize power waste. Practical use scenarios Carpentry and woodworking: align miters, trim angles, and set precise joints for cabinets, shelves, and projects that require exact angle accuracy. Architecture and drafting: verify drawing angles, check layout geometry, and ensure accurate angle relationships in plans. Home improvement and DIY: install tiles, hang pictures, level surfaces, and set precise angles for furniture assembly and renovations.