Hi Randy,
I've not used these but have used other temp/humidity logging devices from ThermoWorks.  Seem to be good quality and free software.
http://www.thermoworks.com/products/logger/logmaster_quadtemp_octtemp.html
http://www.thermoworks.com/products/probe/tc_penetration.html

 A bit pricey, $599 for 4 channel logger and about $50 per probe.

Brion 

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