2 in 1 design: The combination of ruler and protractor can measure the length by a fixed ruler, and measure the length by moving the ruler. The round protractor on the top can be left and right 0-180 degrees. Precision tools: Protractor and angle ruler measuring tools are precision etched, with clear and accurate readings, easy to read, and easy to use High-quality materials: The angle detector is made of high-quality stainless steel, which is and wear-, not easy to rust, and can be used for a long time, but pay attention to the stainless steel edge on the top, and be careful when using it. Adjustable protractor arm: Lock to the desired position by the knurled thumb nut, quickly and easily identify the angle, you can fix the drawing angle, suitable for setting the bevel angle, drawing the radial line, measuring and marking the angle. Wide range of uses: the round head protractor is suitable for engineering, angle measurement, student drawing, architectural design, woodworking, length measurement, and is an for students, craftsmen, architects and designers Model: 180 degrees measuring angle ruler Type: Vernier Angle Ruler Measuring range: 0-180 degrees Measurement accuracy: 1mm Scope of application: measurement colour:Silver Material:stainless steel size:14cm Package Contents: 1 x Protractor Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.