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 70 degree Fahrenheit (-30 - 21 degrees Celsius). This thermometer features a hanging hook and standing panel to keep the device in place, while the 3” diameter dial face is easily readable. The dial measures both Fahrenheit and Celsius on its face.