Feature:The product is made of high carbon steel, which is not easy to rust and has a long service life.The scale is engraved by a precision machine. The figures are very clear and easy to read.The product is compact, portable and suitable for outdoor operation.The measuring precision of the product is very high. It can be precisely measured by fine-tuning and measuring range is 0-320 degrees.Products are widely used in woodworking, construction, mechanical processing and other industries.Specification:Material: High carbon steelRange: 0-320Application: Angle measuringPackage list:1 * ProtractorNote:The actual product color may deviate from the photo due to light.There may be a slight deviation in the measurement of product.Use:The zero position of the universal angle ruler should be calibrated first. The zero position of the universal angle ruler is installed on both the angle ruler and the ruler. The bottom edge of the angle ruler and the base ruler have no gap contact with the ruler. At this time, the main ruler is aligned with the "0" line of the vernier.After adjusting the zero position, any angle in the range of 0-320 degrees can be measured by changing the mutual position of base ruler, angle ruler and ruler.