We have been using Oakton Logger Plus units with a wireless transmitter.  The system will handle up to 700 sensors on a single reciever.  They are a bit more expensive (I think we paid $230/unit for the logger and transmitter, and then had to get a single reciever).

see http://www.4oakton.com for product info.


--
James H Tichgelaar
Assistant Director
Arkansas State University Museum
http://museum.astate.edu

Before you criticize someone, first walk a mile in their shoes.
That way, you're a mile away and you have their shoes.
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