"Refrigerator Thermometers: Cold Facts about Food Safety
Chilling stored foods to proper temperatures is one of the best ways to slow the growth of dangerous bacteria.
A Refrigerator Thermometer Can Make a Big Difference
When it comes to protecting yourself and your family from foodborne illness, one of your most effective tools is the kitchen refrigerator. In fact, at room temperature, the numbers of bacteria that cause foodborne sickness can double every 20 minutes! Chilling foods to proper temperatures is one of the best ways to slow the growth of these bacteria.
To ensure that your refrigerator is doing its job, it’s important to keep its temperature at 40 °F or below; the freezer should be at 0 °F. Since few refrigerator controls show actual temperatures, using an inexpensive freestanding appliance thermometer will allow you to monitor the temperature and adjust the setting of the refrigerator and/or freezer if necessary. Buy one for the fridge, one for the freezer, and check them often."
Check out the full article at: https://www.fda.gov/Food/ResourcesForYou/Consumers/ucm253954.htm