According to Food Standards Australia New Zealand, the food safety standards specify that potentially hazardous foods must be stored, displayed and transported at safe temperatures and, where possible, prepared at safe temperatures. However, you can also use time, rather than temperature, to keep food safe. This method is explained under ‘ The 2 hour/4 hour guide’.
Safe temperatures are 5°C or colder, or 60°C or hotter. Potentially hazardous food needs to be kept at these temperatures to prevent food-poisoning bacteria, which may be present in the food, from multiplying to dangerous levels. These bacteria can grow at temperatures between 5°C and 60°C, which is known as the temperature danger zone. The fastest rate of growth is at around 37°C, the temperature of the human body.
The food safety standards also require you to have a thermometer if you prepare, handle or sell potentially hazardous food. This will enable you to check that safe temperatures are being maintained.