Abstract: A tape measure assembly with a ridge that is disposed along an edge of its housing and is generally perpendicular to the housing's spooling axis. The ridge has a rigidly placed working surface oriented perpendicularly with respect to an outer surface of the housing that is normal to the spooling axis. At least two portions of the working surface extend beyond the outer surface in a direction parallel with the spooling axis, and the working surface and the outer surface define a volume that surrounds the intersection of two generally perpendicular planes. Angle measurement markings can be disposed along a second edge of the housing, a notch can be formed at a center defined by the angle markings adjacent the first edge, and/or a second edge can form a right angle with the intersection of the two generally perpendicular planes.