These are NSF-Certified commercial refrigerators for your milk source(s) to connect to superautomatic espresso machines. then your local Board of Health will likely require a commercial refrigerator for the milk to ensure that it stays fresh. The refrigerator allows you to set the temperature to your liking. An NSF-certified thermometer inside regulates the temperature. The refigerator door has a lock on it so that it can't be opened by anyone but you!