Virtual Caliper measuring virtual things.

[BugRocks1]

I saw this post about how to measure things only from photographies and was curious about it.

http://www.esawdust.com/blog/notreadyforprimetime/files/ScreenCalipersDemo.html

Did you guy's knew there is software just for that?

Real-world Measurements in Virtual Space
http://vimeo.com/5101856

Enjoy.