Mesee 2 in 1 Digital Angle Finder Protractor Ruler - Combines a ruler and protractor for measuring length and angles; features both metric and imperial scales laser-etched on the edge - Equipped with an LCD display for quick, accurate angle calculations; clear digital readout visible even in low light - 360-degree rotation design enables measurement of inside, outside, and reverse angles from 0 to 360 degrees - Features a locking knob to secure the angle at any position; hold button retains measurements instantly - Ideal for DIY projects, construction, woodworking, measuring, sketching, and drawing - Made from carbon fiber and ABS material - Auto power-off screen after 5 minutes of inactivity - Battery installation: Slide the tab at the bottom of the LCD unit, remove the battery compartment, insert battery with negative pole facing up and positive pole down, then reinsert the compartment. Remove battery if not in use for extended periods - Operation: - HOLD Button: Press to freeze displayed angle reading; "H" appears in the upper left corner. Press again to resume measurement - ON/OFF/ZERO Button: Press to zero the device at any angle; press and hold to power off - D/M Button: Switch between degree and minute units - Package includes: 1 x Digital Angle Ruler