.GN 711 rulers are a convenient measuring device for such applications where consistency, repeatability and accuracy measuring various lengths and heights in either a vertical or horizontal position is important.
JW Winco GN43-60-1/2X13-75-D1-SK Leveling Feet The wide range of possible combinations of the base and the stud / socket versions make these leveling feet universally applicable..
SR-Q Series Pro Flood Surface Mount - Single - White Both surface and flush mount options are available and there are multiple mounting capabilities, such as the Suction Cup Mount and Angled Flush Mounts, just to name a few.