Features:  Quick Calibration & Conversion - Press the CALIBRATE button to calibrate the angle gauge to any reference surface & press UNIT button to convert between relative/absolute angles in degrees and tilt percent.  3 in 1 Measuring Tool - Digital protractor, angle finder and level in one tool, large & clear LCD for reading easily and clearly. Flip display to view angle in any direction. With wide measuring ranges of 4×90° and 0.1° resolution.   Convenient Magnets Surface - Built-in magnets base for firmly and securely attaching to any metal surface. Compact and portable size is very convenient for using with other measuring tools.  4 Useful Function - Data hold function, low battery indication, automatic shutdown after 3 minutes without any operation and long press the shutdown button 3-5s to switch power off.  Widely Usage - Suitable for angle calibration of platform & channel angle and runoff slope, grader and tractor working alignment. Setting working angle of circular sawblade, lathes tool, work piece angle for milling & blades angle of miter saws. Angle setting of driller work bench, table saws, jointer table, band saws, jointer fence and band saws table.     Specifications:  Material: Plastics + Iron  Color: Black  Display Type: LCD Display  Measuring Ranges: 4×90°   Working temperature: 32℉-104℉(0℃-40℃)  Resolution: 0.1°/ 0.01%  Battery: 2 * 3V CR2032 Button Battery (Not Included)  Operating Temperature: 0～40℃  Relative Humidity: 40%-80%  Storage Temperature: -10～60℃  Product Size: Approx. 55 * 55 * 16mm / 2.17 * 2.17 * 0.63in  Product Weight: Approx. 38g / 1.35oz  Package Size: Approx. 6.5 * 6.3 * 3.3cm / 2.56 * 2.48 * 1.30in  Package Weight: Approx. 48g / 1.70oz    Package List:  1 * Digital Protractor   1 * User Manual