200mm Angle Ruler with LCD Display and Locking Function Professional Protractor: The protractor has been rigorously tested by us to ensure more precise accuracy. The accuracy of the protractor is 0.2, and the measuring range is 0-360. Folding length of the protractor: 200mm/7.9 inches, total length: 400mm/15.7 inches. 2-in-1 Function: The 2-in-1 combination of ruler and digital protractor can measure length and angle. Very suitable for wood processing, architectural decoration, mechanical processing, architectural drawing, home DIY, school teaching aids. Button function: ON/OFF/ZERO (long press the OFF button to shut down), data lock HOLD button (after locking, no need to worry about data deviation), D/M button. Lightweight and portable: Compared with stainless steel protractors, this protractor is lighter and safer. The stable locking rotator can lock any angle of the protractor. Large LCD Screen: The angle ruler is equipped with a large LCD screen, you can read the data easily, very friendly to impressionable people. If the digital angle ruler is not used for a long time, the angle ruler will automatically turn off to extend the battery life.