Description Combination of ruler and protractor: measure length and angle with an accuracy of 0.3. This angle gauge is a good choice for DIY projects, woodworking, decoration, machining. 360 Degree Measurement: The angle gauge's hinge mechanism allows a complete range from 0 to 360 degrees to measure internal and reverse internal angles. Large LCD Display: Large full-size LCD display, simple operation with only three push buttons, easy to measure and read. Power Supply: CR2032 3V lithium battery, energy-saving mode with automatic power-off function, can work for more than 2,000 hours, saving power consumption and extending battery life. Lightweight and Durable: Thickened and widened ruler with ultra-strong nylon-fiberglass construction material, good rigidity, wear resistance, no deformation LCD Display Maintenance Function Large full-size LCD display, easy to use with only three push buttons, easy to measure and easy to read.NANA