Bubble level is an application designed to check the surface is horizontal or vertical. This bubble level application is simple. This instrument as application performs measurement for measuring the variations of inclination to the horizontal or vertical plane. History Spirit Level Melchisedech Thevenot, French writer and scientist, developed the spirit level in 1661. It consisted of an air bubble inside a container with alcohol, coupled to a stone slit and a lens Its use has only become popu