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Spirit levels, also known as bubble levels, are tools used to determine whether a surface or object is level or plumb. They consist of a long, straight, and usually rectangular body with a transparent vial containing a liquid and an air bubble. The vial is carefully calibrated to indicate when the surface or object is perfectly level or plumb. The liquid inside the vial is typically a colored spirit, such as ethanol or mineral spirits, hence the name "spirit level." The air bubble within the vial moves based on the tilt of the level. When the bubble is centered between two marked lines or within a designated area, it indicates that the surface is level or plumb. Spirit levels come in various sizes, from small pocket-sized versions to larger levels used in construction and carpentry. They may have one or multiple vials, allowing for different orientations, such as horizontal, vertical, and sometimes even diagonal or angular measurements.