Easy and Accurate Measurement The digital angle protractor LCD display for easy and clear reading High Accuracy 0.3 Resolution 0.05.2 in 1 Multifunctional Measurement You can measure the angle of 360 (that is to say the interior angle, the exterior angle) while measuring the length (metric and imperial).Zero and Hold function By pressing the "HOLD" key can record data during measurement, by "ON / OFF / ZERO" you can reset the data to zero when you press for a short press on any angle. There is also the lock button for angle locking at each angle.Lightweight Material Digital angle protractor is made of PVC, smooth and light, its net weight is 56g, no use cumbersome.Easy To Use Digital Angle Protractor is convenient to have two different length units of serious scales on the ruler and it automatically shuts off after 6 minutes of inactivity.