1A Useful Tool: Works effectively as a angle protractor, angle finder and a level measuring tool, also has digital display for easy operation. 2Smart Testing: Designed to have 4 x 90 wide test range, the digital angle meter can easily test the relative angle between different surfaces. 3Strong Magnet: There is strong magnet under the base, so the inclinometer can be firmly fixed on various curved and cylindrical metal material. 4Extensive Use: Allows for wide application in automotive, woodworking, machinery, equipments and many other fields, very practical and useful. 5Easy Carrying: Comes with a light weight and a compact size as well, the convenient storage and carrying enables both indoor and outdoor use. Item Type: Angle Finder Material: ABS Resolution: 0.05 Error: 0.2 Working Temperature: -10-50 Working Humidity: 85% Range: 4 x 90 Battery: 1 x 3.7V lithium battery, with built in battery. Single Battery Capacity: 260mAh 1 x Angle Finder 1 x Data Cable 1 x User Manual