The CIA Masters Collection Freezer Thermometer makes sure your refrigerated and frozen foods are stored at the proper temperature. The quick-read horizontal red column shows the temperature from -40 to +80 F or -40 to +30 C. Freezer and refrigerator safe zones are clearly marked for easy viewing. Strong suction cups attach the Freezer Thermometer to the inside wall of the refrigerator or freezer. The Culinary Institute of America Masters Collection of cookware, cutlery, bakeware, and culinary tools was designed with hands-on involvement and testing by the school's faculty of Certified Master Chefs. Product sales benefit The Culinary Institute of America Scholarship Fund. Washing with a damp cloth is recommended. NSF certified. Lifetime warranty.