Abstract: The present measuring tool facilitates the work of a carpenter, especially panelling work by a direct measuring and reading of the position of cut-outs that are to be made in any type of panel, for example to accommodate utility outlets and other openings. For this purpose a runner or slider is movable along a T-square. A readout window is provided in one face of the runner to directly read the runner position from the scale marking on the T-square. The runner or slider simultaneously has a hole therethrough which forms a template, for example, for standard electrical outlet boxes. Thus, the carpenter may directly work on the panel a hole to be cut into the panel without even memorizing the measurements. A set screw or the like may be used to lock the runner on the leg of the T-square once the runner or slider has been properly positioned on the T-square leg whereby the locked position of the runner acts as a memory for the reading.