The inside of the supermarket freezers thermometer

We almost a week will go to the supermarket buy commodity and food, dairy products generally placed in the freezer, the small steamed bun, seafood, such as general placed in the freezer. Do you know in fact freezer and frozen ark have definite temperature requirements, in the supermarket shopping environment standard mentioned & other; Store fresh area of low temperature storage of goods and raw materials should be configured the necessary equipment, cold storage, Ark) Temperature for - 2 ℃ to 5 ℃, the freezer ( Ark) Temperature is lower than - 18 ℃, the temperature of the hot tank to reach more than 60 ℃ & throughout; 。 As general freezer, freezer is without temperature display, how to determine the real-time temperature of the refrigerator and freezer? Which requires the following the food-grade electronic thermometer, can put the SS304 stainless steel probe in the refrigerator or freezer, display screen placed on the outside of the refrigerator or freezer, real-time temperature measurement.