Durable DesignThe Escali AHF1 Refrigerator / Freezer Dial Thermometer will help you monitor air temperatures in cold storage environments to maintain food safety. The safe air temperature zone for cold storage is indicated on the dial face as well as related HACCP food safety tips. The durable stainless-steel design is NSF certified and easy to clean.Cold Storage Temperature ReferenceA cold storage temperature zone is indicated in blue on the dial face to help quickly verify air temperatures are at or below 41°F.  HACCP GuidelinesCold-holding temperature and time guidelines are included on the dial face for quick reference.NSF CertifiedThe manufacturing process of this product is regularly checked and certified by the National Sanitation Foundation and meets the highest standards for public health protection.Clear & Easy to Read DialThe clear dial display is easy to read and features both fahrenheit and celsius measurements.