Abstract: An apparatus for improving the speed, accuracy, and economy in obtaining linear measurements during construction includes a body that includes a pair of straddle members that span across a thickness dimension of any preferred type of dimension lumber, including wood and synthetic building materials. If desired, the apparatus is designed to straddle a width, rather than a thickness, dimension. A number of receiving locations, such as edges, slots, or recesses, are provided on the apparatus that each correspond with a particular relative position, edge, mark, end, or surface of the dimension lumber. Each receiving location is able to receive and retain an end of a tape measure. An adjustable thumb member is provided that pivots around a center shaft and is adjustable longitudinally to better secure the end of the tape measure. The retaining force provided by the thumb member is adjustable.