An infrared thermometer measures temperature without direct contact by detecting the infrared radiation emitted by an object, while a probe thermometer requires physical contact with the object being measured. Infrared thermometers use non-contact methods and are ideal for industrial applications, offering speed, convenience, and safety, particularly for measuring moving objects or hazardous materials. Probe thermometers require direct contact and are commonly used in situations where physical contact is feasible and necessary for accurate temperature readings, such as in food preparation, medical settings, or laboratory experiments.