Professional ProtractorThe 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 protractor: 200mm or 7.9in, total length: 400mm or 15.7in. Two-in-one functionThe two-in-one combination of the ruler and of the digital protractor can measure length and angle. It is very suitable for wood processing, architectural decoration, mechanical processing, architectural drawing, home DIY, school teaching utensils. Button function ON or OFF buttons OFF or ZERO (long press OFF button to power off), data lock HOLD button (after lock, there is no need to worry about data deviation), D or M button. Lightweight and PortableCompared with stainless steel protractor, this protractor is lighter and safer. The stable locking rotator can lock any angle of the protractor. Large LCD displayThe angle ruler is equipped with a large LCD display, you can easily read the data and it is very friendly for vulnerable people. If the digital angle ruler is not used for a long time, the angle ruler will automatically turn off to extend battery life.