Mesee 2 in 1 Digital Angle Finder Protractor Ruler - Combines a ruler and protractor for measuring length and angles; features both metric and imperial markings laser-etched on the edge - Equipped with an LCD display for quick and accurate angle calculations; clear digital readout visible even in low light - 360-degree rotation design allows measurement of internal, external, and reverse angles from 0 to 360 degrees - Features a locking knob to secure the angle at any position; hold button retains angle readings during use - Ideal for DIY projects, construction, woodworking, measuring, sketching, and drawing - Constructed from carbon fiber and ABS materials for durability - Auto power-off function after 5 minutes of inactivity to conserve battery life - Includes battery compartment: slide out the battery case, insert battery with negative pole facing up and positive pole down, then reinsert the case - Operation controls: - HOLD button displays "H" and locks the current angle reading; press again to resume measurement - ON/OFF/ZERO button powers the device on or off and resets the angle to zero - D/M button switches between degree and minute units - Package includes: 1 x Digital Angle Ruler