Product review (5 stars): Great for chest freezer to kegerator conversion
Since my chest freezer dials only allowed for temperatures of freezing and below, or 50 and above, I had no way of keeping my kegs cold enough to where I like my beer (35-40 degrees).
But this device has been outstanding.  To limit the frequency of which it turns on, I placed the thermometer in a glass/bottle of water.  That way, when the liquid gets to cold, that's when the thermostat kicks in and turns the freezer back on until the liquid is at the desired temp.  Also saves the compressor so it's not kicking on as much.