JRuler

Before I talked about DevToolbar, well that can be a bit much for the average user.
If you quickly want to measure something on your screen in whateva format, you can use this little nifty tool called JRuler.

Hang a shortcut in your Quick Launch bar and voila always ready.

JRuler
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I tell you what, it has more features and clever useful ways to use then you think.

Tnx to Brian again!