Product review (2 stars): Mixed bag
I ordered two units.  One for the deep freezer and one for the freezer on the basement refridgerator.  The one on the deep freeze worked great.  The other one has "mood swings" where the temperature may flucuate 20 degrees up and down in a matter of a few minutes.  This caused about 10 false alarms in the first week.  I threw that one out.