SincereetaliPackage includes: 1x Digital Goniometer 1x CR2032 Battery 1x Instruction Manual Measure 360 & Hold Data Protractor measuring range: 0-999.9; Resolution: 0.05 (3'); Accuracy: 0.5; The goniometer can measure 360 interior and exterior angles, supports degree and degree/minute unit conversion. It has a hold button and a zero button. To lock the data, please press the HOLD button. (Turning the knob is only for loosening and tightening, cannot completely fix the angle) 4 in 1 Multifunctional Digital Protractor: This product is a combination of protractor, spirit level, circular spirit level and ruler. It is calibrated by 3 spirit levels. Help you better measure the angle. (NOTE: This is NOT a digital level, no number is displayed on the LCD screen, can only judge whether the object is tilted). The main ruler is a dual scale in metric and inch. Large LCD Screen & Auto Power Off: This protractor has a large full-screen LCD screen that allows you to read the data easily and quickly. The digital angle ruler will automatically turn off after 5 minutes of inactivity to save power. The digital protractor also has a zero button that can be reset to zero at any position and suitable for absolute and relative measurement. High Quality Material and Portable Design: The thickened and widened ruler body is made of high-strength nylon fiberglass construction material, which has good strength, wear resistance, no deformation, no scratches, light and durable 230 mm, small, delicate design, easy to use and carry. The hanging hole design is convenient for hanging. Wide Range of Applications: This angle measuring tool is widely used in woodworking furniture, building decorations, school, home improvement, mechanical processing and other fields (including angle adjustment of table saws, miter saws, band saws, etc.) Package Contents] 1 Digital Angle Finder, 1 CR2032 3V Battery, 1 Manual instructions.