Trilithon Rulers Description:

Trilithon Rulers is an innovative screen rulers application specifically for Mac OS X. Rulers can
be moved around the screen; Rulers can be stretched and shortened; The horizontal and vertical rulers can be locked so that they move together; Rulers can be set fully opaque, or can be set semi-transparent so that you can see through the rulers to the underlying content; Ruler origins can be set to left or bottom, middle, or right or top; Rulers can be shifted to the edges of the screen; Units include inches graduated in sixteenths, inches graduated in tenths, Picas, Points, Centimetres, Millimetres, Pixels, and Percentage of Length; Scale factors include 100 percent, 200 percent, 50 percent, 127 percent, 78 percent, and percent of length.