When calibrating infrared ear thermometers, various errors may occur. Systematic errors may stem from design defects of the instrument itself or inaccuracies of the calibration equipment. Random errors may be caused by factors such as environmental fluctuations during measurement. For systematic errors, the instrument needs to be overhauled or the calibration method adjusted; for random errors, methods such as taking the average value of multiple measurements can be used to reduce the impact of errors and ensure that the measurement data of the calibrated ear thermometer is accurate and reliable.