Abstract: A device for marking a wall to indicate where to install an element, such as a nail, to mount an article, such as a picture, in a desired position on the wall. The device includes a rigid handle member interconnected by a pivoting assembly to the upper end of a rigid elongate suspension member. The lower end of the suspension member includes a wall-marking element, such as a sharpened pin, projecting perpendicularly from the rear side of the suspension member, and a catch engaging member directly aligned with the wall-marking element to engage, for example, a strand of wire located behind the picture. While the handle member is pivoted to a ready position out-of-line with the suspension member, the pivoting assembly maintains the rear side of the suspension member in vertically suspended position generally coplanar with the wall so that the pin is positioned properly for accurate marking. During marking a stabilizing mechanism immobilizes the upper portion of the picture.