Product review (5 stars): Awesome Datalogger
I bought this Data logger to log temps for Freezers, Ambient Car Temp (in the summer) and various other applications.  Its very easy to use, Windows Interface works without complication for downloading and graphing Temp, Dew Point, Humidity.  Software only works in Windows, but will work under VMWare Fusion (or Bootcamp / Parallels).
This unit was bought used and but was in brand new condition (it appeared it had never been used) - very happy with this transaction and product.

Only drawback I saw was when you download the data, it quits logging new data.  You have to reset the logger (and clear its previous logs) before starting a new log.  You can't "spot check" the temp and then return it to keep collecting data... other than that, its an awesome product.