Q. Who uses a spirit level?

Answer

Professional videographers, surveyors, millwrights, stonemasons, and other members of the building trades all use spirit levels, as do professional photographers. Two banana-shaped, curved glass vials were used at each viewing point on the original spirit levels, making their use more involved.A spirit level may be used for both horizontal and vertical leveling on a wide range of home improvement tasks. There are spirit levels of varying sizes and shapes for use in determining whether or not a surface is horizontally or vertically level. Egyptian builders would use a plumb line attached to a "A" frame, and Romans would fill tanks with water to use as a crude spirit level, to make sure all of their stones were perfectly level.