Terms of the Trade: What Is a Level?
A level is one of those tools that every DIYer should have if they want to achieve professional results when hanging artwork, blinds, shelves, or working with wood. The most user-friendly length is 24 inches, although they come in a variety of sizes, not to mention styles. The most common variety is the spirit level, consisting of a vial of liquid with a bubble that slides around until it is level between two lines. When using this tool, remember the terminology: “level” means parallel to the floor (as in a shelf), while “plumb” means perpendicular to the floor (as in a window jamb).