Food in its various forms is highly perishable. Even food that is pasteurized deteriorates rapidly if left unrefrigerated. Food that is UHT treated becomes perishable once opened.Food that is temperature abused rapidly allows growth of micro organisms that can cause illness or death particularly when consumed by the very young, older or frail people.The best way to ensure food safety is to ensure foods are processed appropriately and then stored appropriately. Temperature monitoring such as that supplied by DAN enables storage temperatures to be reliably recorded.