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