Pixel Meter

This application allows you to measure the distance in pixels between several image points.
Pixel Meter is a small application designed to measure customized areas on your desktop.

Using it is fairly simple: resize the measuring window by dragging its borders and corners. The result is given in pixels with both width and height values available.
Pixel Meter can be moved by gripping the tiny red line with the mouse and dragging it around. Arrow keys can also be used by right clicking the brown border.