Easy to carry: The magnetic miter ruler is compact, small in size, lightweight easy to carry use. Ideal for: inspecting/tilting, installing shelves cabinets, leveling tiles frames, measuring roof spacing, installing windows doors, more. Accurate measurement: The measurement range is 490 (0-360), the accuracy is 0.1 degree, the resolution value is 0.1 degree, which can guarantee accurate measurement. fast precise. Magnetic base: can be attached securely to metal surfaces such as saw tables, fences, blades, etc. ; it converts by reversing the inversion screen. Detailed Design: The digital goniometer features a large backlit LCD display a single battery provides accurate, fast, clear measurements. Contents: battery, screwdriver, manual