Windows 2000, Windows XP, Windows Vista, Windows 7,
For the measurement of something on the screen, there is no need to resort to the use of a sophisticated graphics editor like Photoshop. You simply have to install Perfect Screen Ruler on your computer.
Perfect Screen Ruler is a free tool that allows you to measure the size of an element or the interval between two points on your screen. *It can measure any object on your screen. It can be either a window, a button, image, etc.
To use it, simply move the mouse and press the left mouse button to mark the measuring points in the work area.