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