Quantity: one Isolation box with measuring range 4x90 (0-360) This digital protractor provides measurements with an accuracy of 0 .1 degree at 0 and 90 degree, 0.2 degree allowing residual pressure adjustment between 0.05 degree With the 4-sided magnet you can attach the pressure gauge angle to any steel object. Partially easy to measure helicopter tilt, miter angle, car testing, etc. When the top is lowered, the display automatically reverses. The large EBTN (Enhanced Background Twisted Nematic) LCD screen greatly improves the reading experience. The backlit numbers and letters on a black background are easy to read even in direct sunlight or dim light. The spirit level turns off automatically after 3 minutes of inactivity. Small portable size is perfect for woodworking, construction, machinery, telecommunications, automotive and more. Good quality product