Abstract: An ear thermometer has a main body, and a probe projected from the main body. The ear thermometer has a casing, a sensor module and a plastic tube. The casing has an opening formed in a front side thereof. The sensor module is installed inside the casing. The plastic tube is installed between the casing and the sensor module for positioning the sensor module inside the casing. The probe has an opening formed in a front side thereof for receiving the infrared radiation in a predetermined range. Hence, the sensor module is used to measure true radiation heat from a subject, and prevents the sensor module from measuring an object other than the subject.

Abstract: An ear thermometer has a main body and a probe projected from the main body. The ear thermometer has a casing, a sensor module and a tube. The casing has an opening formed in a front side thereof. The sensor module is installed inside the casing, and has a diameter of between 3.2 mm and 5.6 mm. The tube is installed between the casing and the sensor module for positioning the sensor module inside the casing. The diameter of the probe is reduced for insertion into an external ear canal of a human, and especially that of a baby, to measure true temperature.