Measure-it

Does not work.

Seems to work as promised for me

Does not work. Clicking the extension icon does nothing.

Try it in Browser Mobile Mode. What a fail....

Not working on Tablet and Mobile Mode.

Works fine on a static page, but doesn't work when a modal window in opened on a page.

Doesn't work in responsive mode when touch simulation is on. By the way, I think such a tool should be an integral part of Chrome Developer Tools, like it is in Firefox.

No required permissions and works as expected. Mobile as mentioned would be a nice feature.

It would be really cool and I would give a higher rating if it worked in mobile mode.

perfect. simple and to the point.