Professional Protractor: The protractor has passed our rigorous testing to ensure more precise accuracy. The accuracy of the protractor is ±0.2° and the measuring range is 0-360°. Folded length of the protractor: 200mm/7.9in, total length: 400mm/15.7in. Two-in-one function: The two-in-one combination of ruler and digital protractor can measure length and angle. It is very suitable for woodworking, architectural decoration, mechanical processing, architectural drawing, home DIY, school teaching utensils. Button Function: ON/OFF/ZERO buttons (long press the OFF button to turn off), HOLD data lock button (after locking, there is no need to worry about data deviation), D/M button. Lightweight and Portable: Compared with stainless steel protractor, this measuring protractor is lighter and safer. The stable locking rotator can lock any angle of the protractor. Large LCD display: The angle ruler is equipped with a large LCD display, you can easily read the data and it is very friendly to vulnerable 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. Our service: We are committed to providing you with satisfactory service. If you have any questions, you can contact us at any time. We will reply to you within 24 hours and do our best to solve the problem for you.