Screen Ruler Pro was made for one single purpose -- to be the best screen ruler out there. The tool is highly configurable and comes with different useful options (just some of them listed below):

* measure in pixels, millimeters, centimeters, points, inches

* define your own units

* horizontal and vertical guides

* customizable colors and translucency

* customizable tickers and direction

* rotation and "diagonal" measurement supported

* use figures to measure area and perimeter

* works with multi-display systems

* customizable ppi settings (incl. "screen calibration")

* works on Windows and Mac

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