Used Pixel Ruler for Windows?
Developer’s Description
By CubicDesign
Pixel Ruler features horizontal and vertical orientation, dynamic mouse measurement tracking in pixels and slim design. You can measure the distance (in pixels) between to points or the length of a graphic item (window, button, etc) on the computer screen. No need for other explanations.
This tool can be used by graphic and web designers to measure the size of a graphic object (for example the size of a button) on the screen or the distance between two points on the screen.