1. The built-in magnetic base can be firmly attached to any metal surface for precise measuring and cutting, making woodworking, construction, etc. easier. Digital goniometers in particular are great for settingthe blade angle of table saws and miter saws. 2. The accuracy of the digital display inclinometer is 0.1, the measurement range is 0-360, and the display unit is only DEGREE. The readings can be quickly stabilized and the numbers do not change repeatedly. 3. This digital protractor has 3 function buttons. Long press ON/OFF to turn the device on or off. Press the HOLD button to freeze the reading for easier reading. Press the ZERO key toreturn to zero, which is used to measure the relative angle. 4. This is a small portable digital goniometer. We have provided you with a cloth bag that you can take with you. High-precision LCD display with backlight for clear reading of values even when workingin low light environments. 5. The battery is easy to install without a screwdriver. 2 AAA batteries are included (the product does not come with batteries). It will automatically turn off if not used for 5 minutes, saving energy.