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Meazure - What are the dimensions of that image? How big is this window?
KRuler - KRuler is a screen ruler tool for measuring the size, in pixels, of items on the screen.
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
On-Screen Ruler - lightweight, free, semi-transparent ruler
PMeter - PMeter is a very handy pixel meter.
JR Screen Ruler - JR Screen Ruler, also known as JRuler - Free virtual ruler for your computer screen.