Spirit Level with horizontal angle gauge, vertical angle gauge and bull eye level showing surface inclination. Tool also known as Bubble level, perfect for tilt measurement and surface leveling. Main Features: • Calibration - Increases the precision of the spirit level. It compensates for the curvatures of the phone like a protruding camera or buttons. You can calibrate one flat surface (front or back) and one edge. The selected edge will be shown on the bottom-right button. • Save - Allows y