Features: Double graduation from 0-180 degree High-quality and durable in use. Applicable To: Painting, Work, Measurement, Learning Note: This is a simple protractor, not a precision measuring tool. The angle measurement error is 1. If you are concerned about accuracy, please purchase a digital display protractor. Specifications: Material:Stainless steel Scale length:14.5cm Specification:0-100mm/0-150mm Measurement Degree: 0-180 Degrees Accuracy: 1 Our Product Advantages: Thick High-quality Stainless Steel, The Ruler Body Is Not Easy To Bend Tighten The Screw, You Can Lock The Angle Of The Caliper At Any Time For Marking Measurement Special Craft Laser Scale, Clear And Accurate Reading, Easy To Use 0-180 Arbitrary Rotation, Convenient For Multi-angle Measurement Needs One Foot For Multiple Purposes, To Solve Daily Needs Such As Carpentry Decoration, Student Homework, Architectural Design, Etc. Package Included: 1 x Protractor"