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If anyone is looking for a clear cut guide on the basics of RFID systems I found thisto be particularly helpful: (

The table on the last page lays out the pros and cons of different options very clearly. 

Donal O'Sullivan , Interesting idea! Have you thought at all about what type of RFIDs you would use? I think passive RFIDs would be the go to, but then you would need a fairly high powered antenna that wouldn't be disturbed by the interference caused by the freezer. Any thoughts?