ScreenRule is a useful little utility that enables you to measure anything on screen, in pixels.
As you can see from this picture, ScreenRule is transparent so that you can easily see the objects that you are measuring.

ScreenRule is excellent for any type of graphical work, desktop publishing, and web page design.
Features:
- Clear display of pixels along 4 edges, which can be selectively switched off
- Two independently moveable cursors for precise measurement
- Horizontal, Vertical and Diagonal distances between cursors displayed
- Cursor positions updated in real time
- Transparency can be set between 0% and 60% for greater visibility of measured objects
- Fully resizeable
- Snaps to screen edges for accurate positioning (can be switched off)
Coming soon for just $5