Whether it’s to preserve your food or freeze for long periods of time, keeping track of the cold and freezing temperatures is essential in food preservation. Investing in a properly constructed freezer / fridge thermometer ensures you keep to the food safe temperatures. This thermometer is NSF certified for food safety and measures at about -20 to 80 degree Fahrenheit (-28 - 26 degrees Celsius). This thermometer features an included suction cup to keep the thermometer in place during its reading. The 3-½” x 1-⅛” dial face is easily legible while measuring both Fahrenheit and Celsius on its face.