Levels

For: Finding a point vertically above or below another point, as when positioning columns, building stairs or decks, or aligning framing.
How it works: By gravity—once fixed to a spot, the sharp-pointed weight hangs perfectly plumb on the string. This one attaches to the wall with a built-in punch pin.
Shown: Tajima Plumb-Rite; about $40; acetoolonline.com