Pixel Spy allows you to capture any screen pixel color, measure any screen distance and capture portions of the screen. Each tool has history so you can capture several items and review them later or simply return to Pixel Spy if you forget a color.
Features at a glance.
1. Color sample ⇧⌘C
2. Screen sample ⇧⌘G
3. Measure distance ⇧⌘M
4. Hot keys
5. History