Virtual Magnifying Glass

A little feature that came to mind while working with the magnifier: I often work with interface design and I'm quite picky on alignment. It would be very useful if Magnifier had a little ruler (much like the "aiming" option, except with markers, with perhaps more obvious markers every 5 pixels or so) which would enable me to measure the open spaces more easily (lots of equal-colored areas to deal with :))...