The disadvantage of this tool is that it is a little cumbersome and hardly anybody actually sells them. If the surface you lay it against is not plumb, the line will hang away from the lower beam or curve inwards towards it. When the level is laid against a truly plumb surface, the line will hang directly in line with the lower horizontal beam. The plumb-bob level consists of a roughly F-shaped frame with a plumb-bob attached to the top. The plumb-bob’s line is fed through a hole in the uppermost horizontal beam of the “F” frame and the plumb-bob is suspended and allowed to dangle freely below. Plumb-bob levels, or “plumb rods” have been used for centuries as a simple and accurate way to determine whether a surface is vertical and plumb. If, however, you are only a one-off or infrequent user, then the simplicity and inexpensiveness of a plumb-bob may be the right choice for you. If you are going to be using a laser level on a regular basis, then it may be worth the extra expense. Laser levels are impressive tools, but they can be expensive. They can be set for vertical and horizontal planes for quick and easy reference lines. Laser levels are the high-tech tool of the marking-out world. For checking over long distances, a plumb-bob would be more suitable. The disadvantage of using a spirit level over a plumb-bob is that a spirit level is only accurate over the distance of its length.

If it is more to one side or the other, then your surface is not plumb. If your surface is plumb, the little bubble should line-up directly in the middle of the two lines on the vial. Using a spirit level is an excellent way to determine whether or not a horizontal surface is level, but it can also be used to tell whether a vertical surface is plumb.īy holding the spirit level against a vertical surface and looking at its bubble, you will be able to determine whether the surface is plumb or not. If you don’t have a plumb-bob handy, then there are a few alternatives you can use:

Plumb bob level