How accurate must metal stem-type thermometers be for testing proper internal temperature?

Metal stem-type thermometers are essential tools in food service for accurately measuring the internal temperature of food to ensure safety and quality. The correct level of accuracy for these thermometers is plus or minus 2 degrees Fahrenheit. This precision allows food service personnel to effectively monitor cooking temperatures to prevent foodborne illnesses, as it ensures that food reaches the appropriate temperature necessary to kill harmful microorganisms.

Using a thermometer that is accurate within 2 degrees is sufficient for most cooking and holding applications. It strikes a balance between precision and practicality, providing a reliable indication of whether food has been cooked to the safe minimum internal temperatures established by health guidelines. In contrast, the other levels of accuracy suggested (1, 5, or 10 degrees) may not provide the necessary assurance of food safety, as a variance of 5 or 10 degrees could result in undercooked food, while a variance of just 1 degree may be overly stringent for general usage in a busy food service environment.