1. Multifunctional Angle Finder: The protractor features metric (mm) and imperial (inches) measurements on the ruler edge, along with an accurate digital display for measuring both angles and lengths. Horizontal and vertical spirit levels assist in checking and calibration (note: these are not displayed on the LED but help with determination). 2. ** Accuracy**: This digital protractor covers a full range of 0360° to measure inner angles, outer angles, and contrast angles. With a measurement accuracy of ±0.5° and a resolution of 0.05°, you can switch between degrees and minutes to enhance precision, meeting various accuracy requirements. 3. **Hold Data**: Press the hold button to lock the measurement at any angle, enabling users to record angle values effectively. The angle lock function ensures maintained accuracy, making it ideal for woodworking, construction, or drafting. 4. **LongLasting Battery**: Exceptional endurance allows continuous operation for over 2000 hours. The digital angle finder's autoshutoff feature conserves power and extends battery life. It also includes a large LED display for easy reading.