Measure 360 and Keep Data Protractor Measurement Range: 0-999.9 Resolution: 0.05 (3 ) Accuracy: 0.5 The goniometer, can measure interior and exterior angles of 360, supports conversion of units of degree and degree / minute. It has hold button and zero button. To lock the data, please press the HOLD button. (Turning the knob is only for loosening and tightening, cannot fully set the angle. 4 in 1 Multifunctional Digital Goniometer: This product is a combination of protractor, bubble level, circular bubble level and ruler. It is calibrated by 3 bubble levels. Help you better measure the angle. (NOTE: This is NOT a numeric level, no number is displayed on the LCD screen, can only judge whether the object is tilted). The main rule is a double scale in metric and in inches. Large LCD screen and automatic shutdown: This protractor features a large, full-screen LCD display that allows you to read data easily and quickly. The digital angle ruler automatically turns off after 5 minutes of inactivity to save energy. The digital protractor also has a zero button which can be reset to any position and is suitable for absolute and relative measurement. Wide range of applications: This angle measuring tool is widely used in carpentry furniture, building decorations, school, home renovation, mechanical processing and other fields (including adjusting the angle of table saws , miter saws, band saws, etc.) Package contents: 1 digital angle finder, 1 CR2032 3V battery, 1 instruction manual. CE and FC certification passes.