Measure Tool

I know this sounds really basic, but I'm fed up...

It seems that I have lost the measure-tool's options menu.  At one point I could click the measure tool and there was a little pop-up that would show the units and precision, now its gone.

At one point I was working on two monitors and now I am back to one monitor.  I am guessing that it is lost in space somewhere when I changed my screen layout.  I can't see it anywhere on the edges of the screen.  Anyone have any idea how to get it back?

Thanks,

Chris

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