Recent studies show that the risk of listeriosis—a foodborne illness that can be particularly dangerous for pregnant women and their unborn babies—drops significantly when foods are chilled to a safe temperature. The temperature inside your refrigerator should get no higher than 40°F—and only a fridge thermometer can help you ensure that you’re storing foods at a safe temperature. You can do an Internet search to find a thermometer just right for your fridge or put a regular instant-read thermometer in there.