Measure 360 and Retain Data Protractor Measuring Range: 0-999.9; Resolution: 0.05(3'); Precision: 0.5; The goniometer, can measure interior and exterior angles of 360, supports conversion of degree and degree/minute units. 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 fix the angle 4 in 1 Multifunctional Digital Goniometer : This product is a combination of protractor, spirit level, circular spirit level and ruler. It is calibrated by 3 bubble levels. Help you measure the angle better. (NOTE: This is NOT a digital level, no numbers are displayed on the LCD screen, can only judge whether the object is tilted). The main ruler is a double scale in metric and inches. Large LCD display and automatic shutdown : This protractor has a large full-screen LCD display that allows you to read the data easily and quickly. The digital angle ruler automatically turns 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 is 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 hardness, wear resistance, no deformation, no scratches, light and durable 230mm, small , delicate design, easy to use and carry. 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 renovation, mechanical processing and other fields (including angle adjustment of saws). table, miter saws, band saws, etc.) Package Contents] 1 digital angle finder, 1 CR2032 3V battery, 1 instruction manual. Passed CE and FC certification.4-in-1 Multifunction High Precision 360 Degree Digital Angle Finder Protractor Angle Finder Level Finder Scales Ruler Our eyes are not as precise as the machine and there are always has errors in readings. With digitalization, you can make everything easier. This is a digital angle measuring tool, which can let you measure more accurately, work smarter and have higher productivity. The goniometer is very suitable for carpentry marking, framing, custom furniture construction, staircase and terrace construction, etc. Friendly Tips: 1.The button is not used for locking. The knob can only be loosened or tightened according to the user's usage habits and needs. Tightening cannot completely fix the angle, just avoid moving the digital angle ruler when drawing a line, making measurement more convenient and reliable. 2. If you want to "reserve" the angle value you need, you must use the data retention function. You need to press the red HOLD button instead of rotating the knob to lock. 3.It can be used as a spirit level, helping you check and calibrate (NOTE: This is not NOT a digital level, will not show the number on the LCD screen, only help you judge whether it is horizontal/vertical/the horizontal plane is tilted or not) 4. The LCD screen is flickering or the digital display is incomplete, it means the voltage is too low, please replace the cell with a new one in time. 5.The surface of the LCD screen has a Protective film to prevent scratching the screen during transportation. If the protective film is scratched, please remove it and don't worry about the quality problem, thank you! Features: Allow 360 degree measurement Internal and external angle p> With horizontal bubble/vertical bubble/circular spirit level Main ruler with metric and inch scale lines Large, easy-to-read LCD display Data hold function to keep the necessary angle value Zero button for absolute and relative measurement Degree/degree-minute unit conversion to respond to differe