

Cubic Ruler is a very simple to use screen ruler. You can measure de distance (in pixels) between to points or the length of a graphic item (window, draw, paper, etc)
The JR Screen Ruler is a great tool that allows you to accurately measure anything on your screen. This is especially useful when measuring graphics, web page browser sizes or whatever. Screen Ruler can display Pixels, Inches, Picas, Centimeters.
Perfect Screen Ruler is a graphics tool that allows you to accurately measure anything on your screen.
ScreenTools is a quick and small tool that combines capabilities of screen magnifier, screen ruler and color display in the single application. It is the best choice for designers, web-masters and GUI developers.
A Ruler for Windows
$10.00 - Rob Latour
A Ruler for Windows is an on-screen pixel ruler for your PC. It provides you your choice between a rich woodgrain ruler, or at the touch of a button, a clear see-through plastic ruler. With A Ruler for Windows you can use your screen normally while layering one or more rulers over of your work. As you can see through the clear plastic ruler you can even continue your typing under it. Special 2x, 3x, and 4x modes allow you to take a snapshot

Atrise Golden Section
$19.95 - Atrise Software.
Golden Section is an adjustable transparent design grid for web, graphic, logo and UI designs. It allows you to control and correct the sizes and proportions in your design project using the golden section ratio. Key features: multiple grid modes, including section grid and square grid; adjustable user interface for GUI, web and image design; full controllability over the mouse and keyboard; advanced settings for power users

GAX reloaded
$5.95 - Dolphiq Software Development
GAX is a powerful application for web designers, graphic designers and everyone else who works with graphics. It contains a colorpicker, a screen ruler, and a screen capture tool.
Pixel Ruler
Free - Mioplanet
Pixel Ruler features horizontal and vertical orientation, dynamic mouse measurement tracking in pixels, cool design.
Reglo
$15.00 - Basta Computing, Inc.
Reglo is a versatile graphics design tool including an on-screen ruler, a color picker, a magnifier, a mini-screen capture feature, and the ability to resize the windows of other applications.

Desktop Ruler
$14.95 - Coder Ltd.
Desktop Ruler is, just as its name indicates, a virtual ruler utility/tool for your desktop. It has customizable size, color, transparency, orientation and scale in pixels, centimeters or inches, as well as some other useful features like Precise Measuring Tool with adjustable zoom, capable of measuring on-screen distances in any angle, not just along the ruler, support for multiple monitors systems and customizable double-click action.
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