Screen Ruler is designed and made for one single purpose - to help you to measure anything on your screen. The tool is highly configurable, comes with different useful options:
* measure in Pixels, millimeters and centimeters
* horizontal and vertical guides
* customizable translucency
* customizable tickers
* "Stay on TOP" window style (floating over other windows)
* Screen edges snapping
* Remembers last state (position and options)
* Mouse and keyboard moving/resizing
* FREE to use