Professional protractor: This protractor has passed our rigorous tests to ensure greater accuracy. The protractor has an accuracy of 0.2 and a measuring range of 0-360. Folded length of the protractor: 200mm/7.9 inches, total length: 400mm/15.7 inches. Two-in-one function: The two-in-one combination of ruler and digital protractor measures lengths and angles. Ideal for woodworking, architectural decoration, machining, architectural drafting, DIY, school teaching tools. Button functions: On/off button/zero point (press and hold the off button to turn it off), data lock HOLD button (when locked, you don't have to worry about data deviation), D/M button. Lightweight and portable: this protractor is lighter and more secure than stainless steel protractors. The robust locking swivel locks the protractor at any angle. Large LCD display: The angle gauge is equipped with a large LCD display so you can easily read the data and is very friendly to vulnerable people. If the digital angle ruler is not used for a long time, the angle ruler will automatically switch off to extend the battery life. Quantity delivered: 1 piece