What tool is most commonly used to measure the temperature of food?

A food thermometer is the most reliable tool for measuring the temperature of food. It is specifically designed for this purpose, ensuring accuracy and safety when determining if food has reached the appropriate cooking temperatures. This is critical in preventing foodborne illnesses that can arise from undercooked foods. A food thermometer can measure both the internal temperature of meats and the temperature of various types of cooked dishes, making it a versatile instrument in the kitchen.

Other tools listed do not serve this specific function. For instance, a food processor is designed for mixing or chopping ingredients rather than measuring temperature. A temperature gauge, while it may indicate temperature, is not typically employed specifically for food and lacks the precision needed for safe cooking practices. A microwave oven is used for heating food but does not measure the internal temperature of the food being cooked. Therefore, the food thermometer is the optimal choice for accurately gauging temperatures in food preparation.