What do you use for a refrigerator Thermometer ?

The acurite is hard to beat. If you use a 'wired' unit, then even a thin wire through the freezer/fridge gasket can cause problems. Be sure ANY battery type unit (like the acurite) that goes in the FREEZER has lithium batteries NOT alkaline, normal, or rechargeable. The lithium are not affected by the below freezing temps as are the others and will last longer.