Measure distances and sizes on screen with Perfect Screen Ruler
Perfect Screen Ruler is a free tool that allows you to accurately measure anything on your screen. You will find out the size of any item on the screen, for instance, the size of a button or the distance between two points.
You will be able to enlarge the image if necessary. It is useful when you measure some small images or when you need to study the enlarged area of the screen in detail.
Use the left mouse button to mark the measurement points in the working area of the program.
To make it more visual, these points are connected together with a line and enclosed into a rectangle. In the right part of the screen you will see the vertical and horizontal distance between these two points in pixels.