Google Maps API; how to add a scale measure on a map?

Question

I suspect part of my problem is that I'm having a mental freeze on what the technical name for this is: But you see on http://maps.google.co.uk/ the bottom left has a small ruler indicating how big x Miles is at the current zoom level?

If I'm using google Maps API version 2, how do I add such a wonderful do-hickery widget thing to my website maps?

Thanks, James

Answer 1

From the API docs:

GScaleControl - a map scale