Multifunctional Silicone Foldable Fresh-Keeping Oil-Proof Splash-Proof Cover Description Show Less Features: 1. Professionally measure the inner and outer angles and angles of objects 2.0-360 complete measurement. 3.Easy to lock at any angle, compact, accurate measurement, easy to read. 4. With a locking knob, convenient to lock the angle at any position. 5. 5 minutes automatically shut down, induction automatically boot. 6.Button function: open / key, clear key, data hold button, degree and degree conversion button Material:Carbon fiber + ABS Size:about 220mm; Measuring range: 0-360 Resolution: 0.1 Accuracy: 0.3 Working power: 3V Battery model:1*CR2032(included) Operation time: 5,000 hours Operating temperature: 0 C - +50 C Working humidity: 85% Automatic closed screen time: 6min Usages: Measurement of angle and length Packing includes: 1* 2-in-1 Digital Angle Ruler.