Accurate Measurement: The accuracy of the protractor is 0.3 degrees. This is a good choice for most projects and daily use. Has an easytoread precision infrared engraving scale with clear scales. Elaborate Design: The internal Oring mechanism can be rotated during operation to ensure that accurate readings can be obtained on both the internal and external corners, and to avoid wrong measurements during the bevel cutting process. 360 Protractor: This protractor is designed to help you measure the correct and precise bevel angle effortlessly. The protractor supports any angle measurement from 0 to 360, which can provide you with the exact angle you need, which is very practical. Easy to Use: Due to the adjustable and foldable design, the miter saw angle finder is not only easy to use, but also easy to carry or store, and has a unique tightening mechanism that can be operated with hand. Rugged and Durable: This triangular fixture goniometer is more durable and sturdy than other pvc plastic saw miter gauges because it is made of highquality ABS. In addition, the miter saw gauge is scratchresistant in daily use.