Clear and easy to read: Magnetic goniometer, brown high-impact visibility body, transparent lens, easy to read in 4 quadrants, increments of 0-90 degrees, v-shaped groove edge can accommodate tubes and ducts, super strong And permanent ceramic magnets, convenient metric rulers on one edge, and British rulers on the other. A good tool for finding any angle: Magnetic goniometers are designed for use in electrical appliances, pipelines, and require magnetic contact with pipes, conduits or other iron surfaces in order to accurately identify angles. It is easy to use. Just place it on any inclined surface and the sphere will point at an angle of 180 degrees. Rugged and durable: It is made of plastic material, which is shock-resistant, anti-ultraviolet, and prevents leakage. size:95x30x105mm Material:plastic colour:White, transparent Package Contents: 1 x Angle locator Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.