The main purpose of a level is to determine whether a surface is horizontal (flat) or vertical (upright), by monitoring the position of the bubble inside a liquid-filled vial. Machine levels are instruments high-precision tools used to ensure the correct alignment of machines and equipment. They measure small inclinations usually in millimeters per meter (mm/m). Square levels are used to check the perpendicularity of surfaces. They confirm that two surfaces form a 90-degree angle. Digital levels provide accurate angle and slope measurements, displaying the results on a digital screen. Measurements are usually made in degrees (°) or slope percentage (%).
