【Angle Finder Protractor】--- This Protractor Can Quickly Measure the Angle Data. With Horizontal and Vertical Bubble, Help You to Judge Horizontal Vertical or Not (Note: NOT a Digital Level, Data of Digital Level are not Displayed on the LCD Display.) 【Accurate】--- Angle Range is 0-225°, Measuring precision: ±0.5°, Increase/Decrease Angle: 0.1° 【Mechanical Lock Knob and Data Hold】--- With Lock Knob, Help You to Keep the Angle Constant when Scribing or Measuring Angles. Data Hold Function to Keep the Numbers on the LCD Screen Unchanged 【Multifunction】--- LCD Display and Backlight Design Can keep Angle Finder Normal Use on Dark Light. Also Come with Automatically shut off and Low power Alarm Function 【Portable Bag】--- Equip with Portable Bag for Easy Store and Carry. This Angle Finder Ruler Is Mainly Intended for Applications Which Involve Lineation for Woodworkers, Measure and Definition of the Exact Angles such as Trays, Sloping Roofs and Handrails, Weight: 1.433004703 pounds, Manufacturer: Proster