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