Proper temperature prevents food spoilage. Your fridge should register between 35 and 40 degrees F. Your freezer should be at -5 to 25 degrees F. Make sure everything stays adequately chilled with this easy to read thermometer which stands or hangs. Features:. Stainless steel housing. 2-1/8 Diameter. Works in refrigerator or freezer. Easy to read dial. Reads in Fahrenheit and Celsius.