Hello. Can I get some brief reactions to the idea of devices designed to count visitors entering an exhibition space?  Specifically, I'd like to know if anyone has used a system that proved successful (inexpensive, accurate, fairly unobtrusive) to measure visitation?  I'm working with a team of curators on a large (~20,000 sq ft) transportation exhibit and need to explore interesting and innovative ways to measure visitation.  I would like to have an idea of how much it would cost (ballpark, of course) what questions I should be asking and, if possible, which companies I should be speaking with.  I thank you all for any ideas you might have.   
Laura Hansen
National Museum of American History
Smithsonian Institution
Washington, D.C.

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