Aquaruler is a very powerful screen measuring utility with a wide variety of features. Aquaruler measures in a variety of units. It can be useful to all sorts of designers, programmers, and other people whom use their mac for productive purposes.
What's new in Aquaruler
Version 4.2.4 adds the following:
Color under mouse in zoom can now be shown as RGB percentage, RGB value, RGB hex, and Web safe hex
Zoom can now be locked around a point on the screen
Mouse indicator in zoom is now a small square
Resolution box can now have a smaller resolution box nested inside it