ScreenRuler Demo 0.3

ScreenRuler is a unique and popular tool for assisting with reading on the PC and Mac. It provides a strip or ruler across the screen, which can have the contrast changed and have the background coloured or greyed out.
ScreenRuler works with any piece of software as it acts as an overlay on the screen. From a technical point of view, it should not interfere or clash with the computer's video card.