Kitchen
Why a Refrigerator Thermometer Is Worth Having
The number on a refrigerator's control is a setting, not a measurement of the actual air temperature around your food. A simple appliance thermometer tells you whether the refrigerator is really staying at 40°F or below, which is the temperature FDA recommends for refrigerated food safety.
It is especially useful in older refrigerators, crowded refrigerators, garage units, and after a power interruption. For very little cost, it answers a question the appliance's dial often cannot.