Item Type: Digital Display Angle Ruler Material: Stainless Steel Measuring Range: 0-360¡ã Optional Specifications: 200mm; 300mm; 500mm Reading Value: 0.05¡ã Accuracy Error: Plus or minus 0.3¡ã Power: 3V (CR2032 ¡Á 1) (Not Included) Key Function: On/Off key clear key, data hold key, degree change key. 1¡¢The product is made of stainless steel, which is not easy to rust and has a long service life. 2¡¢The scale is engraved by a precision machine. The figures are very clear and easy to read. 3¡¢Multi-function Key Function: On/Off key clear key, data hold key, ¡ã / '' conversion key. 4¡¢ Professionally measure the inner and outer angles and angles of objects. 5¡¢With a locking knob to facilitate the locking angle at any position.1 x Digital Display Angle Ruler