Learn how to use a level tool and check it for accuracy. Also learn what type is right for your job or project.
To do this you simply place the level on a flat surface and check the bubble. Make marks on the surface so when you turn the level you can turn it in the exact spot. Once marked turn the level end for end and recheck the bubble. Each time it should be in the same exact position. Once you have done this use the other edge of the level and repeat the same process checking the bubble each time for accuracy. Each time the bubble should be in the same position. Now check for plumb accuracy by holding the level against a flat vertical surface.
If the new level does not test out accurate, do not purchase. If your existing level does not check out you may be able to adjust the vials to bring it back to center. The better levels have adjustable vials. If yours has adjustable vials then adjust them by loosening the screws holding the bubble assembly. Once you have them loosened turn the assembly until the level reads correct. Electronic levels should also have a calibration setting.
Levels come in many sizes and shapes. The most common levels are the 9-inch torpedo and the 24-inch style. Levels are made of plastic, wood, or aluminum. Some have fixed vials others have adjustable vials. If your level has fixed vials, you will not be able to adjust it.
Every level will have at least one vial for horizontal use and one for vertical. Some have 45-degree vials as well. The vials are filled with a fluid and an air bubble. When the bubble is centered between the two lines on the vial, it means the surface is level vertically or horizontally.
If you are doing construction work the longer the level the more accurate your reading will be. If a board is crooked, you will not necessarily catch it using a level under 48 inches.
Some levels 48 inches in length or longer are great for checking level and plumb and can be used as a straightedge.
Levels with a bevel gauge and electronics are useful for checking angles for mitre cuts.
Torpedo levels as mentioned earlier are one of the most popular. It is a small level usually 9 inches and fits easily in tight spots. They come in bubble style and electronic. They generally have at least three vials and the better ones have a magnetic edge, which is very handy.
Some levels come with stud finders and are laser beam equipped for easy leveling of just about anything.
A square level is a small level designed to hold two metal rulers to form a square.
The bubble of a level always runs up hill so when spacing is needed always put it under the end of the level you want the bubble to run to.
