Abstract: A combination tool for craftsmen including a square, a level, a plumb indicator, a slope measurement device, a linear scale, and a straight edge. The tool includes a pair of elongated members joined at a hinge with a protractor scale for measuring the angle between the members. The hinge comprises a sturdy clevis arrangement which allows a central fastening assembly to be tightened to provide friction in order to set the angle between the two arms without other locking structure. A series of markings along one edge of each of the members provides a linear scale. Each of the elongated members have an I-beam construction with a central web and a pair of side flanges. A number of elongated cutouts are provided for handles. A second series of cutouts are provided to position a plurality of spirit level indicators. Some of the spirit level indicators are aligned along the longitudinal axis of the members, while others are positioned transverse to the longitudinal axis.