Data Hold Function: With clamping function, tighten the knob after measurement to keep the measurement data unchanged. Data retention. Reset button for zeroing at any angle for relative measurement. Hold button to hold angles at any time without worrying about data deviation. 0-360 Digital Protractor: The protractor allows a full range of 0 to 360 degrees to measure interior and reverse angles. Measuring length: 0 to 200 mm. Can be used for woodworking, construction, sketching, drawing, crown molding, baseboard molding and more. Large LCD DisplayThis angle finder with ultra-large screen, clear reading, multi-function ruler, can measure length and angle in metric and imperial display. The digital LCD display is easy to read and prevents guesswork. With Size: 22 x 3.5 cm Reverse Display Function: This angle finder tool can be reversed. When measuring a large angle, just long press the reverse key to turn the reading upside down, which is convenient for users. Measure both length and angle with an accuracy of 0.3. Wide Application: The angle finder is a combination of ruler and protractor, it is multifunctional, you can measure lengths and angles for easy measurement. Measuring angles: internal angles, external angles, bevel angles. Measuring length: in millimeters/inches. This digital angle finder is ideal for various professional and DIY applications. Good addition to the toolbox. Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.