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 precision 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 RulerMaterial: Stainless SteelMeasuring Range: 0-360Optional Specifications: 200mm; 300mm; 500mmReading Value: 0.05Accuracy Error: Plus or minus 0.3Power: 3V (CR2032 1) (Not Included)Key Function: On/Off key clear key, data hold key, degree change key.Package List:1 x Digital Display Angle Ruler