The Refrigerator and Freezer Thermometer (Model 29006) measures -40°F to 80°F (-40°C to 27°C). It is made of stainless steel and is easy to read. The numbers used to adjust the temperature on most refrigerators and freezers only raise or lower the temperature. They usually do not reflect the real temperatures in your refrigerators and freezers. A different measurement may be needed to monitor and maintain the true temperature. Use this refrigerator thermometer, (with readings in Fahrenheit or Celsius) to assure your refrigerator and freezer is at the correct temperature.