Is there a magnifying ruler to measure pixels?

I have been looking for this for a while:

There are a ton of ruler extensions for all the common browsers but I can't find one that has a magnifying glass. Can anyone help me out please?

I'm talking about a magnifying glass like the Awesome Color Picker extension in Chrome:

The ruler extensions I've used really hurt my eyes when trying to measure anything to pixel precision.

Any browser is fine with me.

Note #1: This is not about seeing the width of elements through 'inspect element'. I need to find the precise number of pixels between any two points on a web page.

Note #2: Zooming in the browser doesn't do it either because some of the pixels change when I zoom.

Thanks in advance!

I am not sure if this is what you were looking for, but it might be worth checking out. It has zooming in on pixels, up to 3200%.

http://matthiasschuetz.com/pixelzoomer/

It's a FireFox add-on. I am not affiliated with the add-on at all.