A multi-purpose spacer provides working surfaces for properly spacing studs, joists, rafters, and decking. The spacer (also referred to herein as a “tool” or “jig”) includes an adjustable spacer for balusters used in staircase railings, deck railings, and the like. The spacer may be constructed of a light metal, preferably aluminum, or suitably rugged plastic, and may also include a removable, padded handle to ease transport and use. Embodiments of the invention provide a spacing tool that is (for all practical purposes and in accordance with typical tolerances in the framing carpentry industry) completely temperature- and humidity-immune as well as waterproof.