In my design, I focused on the way of displaying the equality of inclination on the spirit level. It consists of a transparent ring with a groove in which a shaped ball travels. When tilting the entire spirit level, the ball always stays at the bottom and shows the angle of the inclination on the line. The second point that I took into account is the length of the spirit level itself. The spirit level consists of 40 cm aluminum pieces, which can be attached to each other thanks to the middle plastic part.
