Screen Ruler is a collection of simple-to-use, yet powerful tools for working with on-screen graphics. It includes four handy tools including: box and line measurement tools for making pixel perfect measurements, a color picker for determining the exact color of a pixel, and a grab image tool for making screenshot selections.

The Box Measurement Tool provides a way to get the exact pixel width and height of an area anywhere on your display.

The Line Measurement Tool determines the length between any two pixels.

The Color Picker provides an easy way to obtain a web-ready hex color, or Core Graphics compatible RGB fraction from anywhere on your display.

The Grab Image Tool allows one to take a screenshot of anything on-screen.

Screen Ruler is a great utility for anyone that works with digital graphics, including: web designers, graphic artists, and programmers.

Requires Mac OS 10.6 (Snow Leopard) or 10.7 (Lion).