What does the spirit level tool indicate?

The spirit level tool, also known as a bubble level, is specifically designed to indicate whether a surface is level or plumb. It contains a liquid-filled vial with an air bubble; when the bubble is centered between the marked lines in the vial, it shows that the surface is perfectly horizontal (level) or vertical (plumb). This tool is essential in construction, carpentry, and surveying, as it ensures that structures and components are aligned correctly. By being able to determine levelness accurately, professionals can create stable and safe environments for any project. The tool does not measure temperature, pressure, or distance, which are functions of entirely different instruments.