Due to the fact that the storage and transportation time of food is not a short-term issue, the relative equilibrium humidity during food preservation is an important indicator for ensuring food safety, and it directly affects the growth of bacterial colonies. For example, in the equilibrium relative humidity range of 95% RH to 91% RH, the bacteria that are prone to growth are Salmonella, Burkholderia, Lactobacillus, mold, and yeast. The shelf life of food is also related to temperature and equilibrium relative humidity. A cake with an equilibrium relative humidity value of 81% RH has a shelf life of 14 days at 27 ℃ and 24 days at 21 ℃. If the equilibrium relative humidity is increased to 85% RH, these indicators will decrease to 8 days at 27 ℃ and 12 days at 21 ℃. The equilibrium relative humidity of hygroscopic substances plays a decisive role. Balanced relative humidity is defined as the humidity value obtained from the surrounding air without exchanging water between a substance and the air. This definition is clear, in order to successfully store and maintain these products, the control of environmental climate and packaging must be carefully specified. Meanwhile, many foods stored in excessively dry conditions can have a slightly unpleasant taste. In response to this situation, it is required to record temperature and humidity changes in real time to ensure that food enters consumers' mouths safely.

It is very important to prove that the goods have been in the specified temperature and humidity conditions at the time of receipt when transporting or shipping frozen and refrigerated food over long distances. The solution to resolving disputes is to place a recorder in the cargo hold during shipment and activate it,Temperature and humidity recorderThere is a precise internal clock that faithfully records temperature and humidity data corresponding to time intervals. When retrieving, it is easy to use a computer to view graphic files and alarm values, determine whether they exceed the allowable value, and easily obtain when and duration. The carrier's responsibility will also be immediately known.