Strong magnetic base: The base has built-in strong magnets that can attach the connection system to any iron surface and is IP54 waterproof. Small and light Small and lightweight, easy to carry Large EBTN LCD screen: The large EBTN (Enhanced Background Twisted Nematic) LCD screen greatly improves the reading experience, and the bright numbers and letters on the black background make it very easy easy to read, even in direct sunlight or low light. Auto Power OffThe display automatically reverses when you lower your head. Automatically turns off after 3 minutes of inactivity Wide application: Angle protractor provides fast and accurate measurement in carpentry, construction, machinery, telecommunications, automotive and other areas. The product does not include batteries. Note: The data are all measured manually, please allow 1-3cm error due to differences Due to light and display, there may be some color differences, please refer to the actual item received.