This Helix protractor features a clear base with 180-degree gridlines for clarity. Measuring 10cm, it also offers a reversed scale. Ideal for measuring and drawing angles, it is suitable for use in Geometry or Mathematics classrooms. The protractor is constructed from durable, lightweight plastic, making it easy to carry in a school bag or keep on a desk. It is perfect for architects, engineers, artists, designers, students, and teachers. The scale is clear and easy to read, with markings to 1 degree and numbered every 10 degrees, offering precision for drawing or measuring. It can be used for geometry, design, and drafting.