Locking Knob DesignAngle Finder Protractor with Locking Knob Design Which you can Easily Locking Angle at any Position, no need to Worry about the Angle will Change when Moving the Ruler.With Large LCD DisplayDigital Angle Ruler with Large LCD Display for Easy Reading. And The Accuracy 0.3; resolution 0.05; measuring range: 0-200mm/ 0-360.Easy to UseDigital Angle Finder Ruler and Protractor 2 in 1 Combination for Easy Measuring, is a Convenient Tool for Drawing and Measuring.High Quality Digital Angle Finder Protractor Ruler is Made of High Quality Carbon fiber + ABS , Practical and Durable. Suitable for home Improvement, Woodworking, Workshop etc. , Students can also use it.Auto off "Hold" Function: It will Shut Down After 6 Minutes of Inactivity Automatically, The Hold" Function You can save data during the measurement by pressing "HOLD". The display can be inverted for easy reading by long pressing "HOLD" to press.Size219*35mmPackage included1pcs*Digital Angle Finder Protractor Ruler