Environmental factors have a significant impact on the calibration of infrared ear thermometers. Changes in temperature and humidity can interfere with the sensor accuracy of the ear thermometer. For example, in an overly humid environment, water vapor condensation may occur inside the instrument, affecting the normal operation of the measuring components. At the same time, insufficient battery power of the ear thermometer itself will also lead to inaccurate measurement, thereby affecting the calibration results. In addition, improper use methods, such as the probe not being inserted into the ear canal correctly or not maintaining the appropriate angle during measurement, are also factors that affect calibration.