This tool can be used for: ◉ Picture frame alignment ◉ Measuring angles and slopes ◉ Checking the surface level of tables, shelves or any other object ◉ Measuring the inclination of a ship, aircraft or car ◉ Roof pitch calculation ▶ Calibration instructions: - To calibrate the level, hold the device upright against a reference surface ( landscape mode with the button to the left ) and press the red Calibrate button. Download this app today!