15 inch / 400 mm Digital Angle Protractor with Zero/Hold and View/Lock Function for Woodworkers Craftsmen Protractor Homemakers 📏【2-in-1 ABS Protractor】—A two-in-one angle ruler that doubles as a ruler. It measures both length and angles. Made of durable ABS. <br /> 📏【Easy to Read】—A 15-inch/400mm ruler with two scales, centimeters and inches, and laser markings for easy reading. The protractor features a large LCD screen for clear readings. <br /> 📏【High Precision】—The protractor has an accuracy of ±0.3 degrees; a measuring range of 0-999°, and the ruler can rotate over two full rotations. Its resolution is 0.1°. We guarantee you accurate measurements. <br />📏【“H0ld&Rev” Button】--During measurement, press “H0LD/Rev” to freeze the measurement data. Moving the ruler again will not change the measurement data. Long press “H0LD/Rev” to flip the screen 180° for easier reading. <br />📏【Any Angle Measurement】--Press the “ZER0” button to reset the angle display. You can start measuring from any angle. <br />📏【Lock Knob】--Turning the large knob will keep the ruler at any angle to prevent movement or loss of the measurement angle. </li> </ul>