First, prepare the standard instruments required for calibration, such as a high-precision thermometer that has been calibrated by metrology. Then, place the infrared ear thermometer and the standard thermometer in the same environmental conditions and stabilize for a period of time. Next, use the standard thermometer to measure the temperature according to the operating specifications, and use the infrared ear thermometer to measure at the same time. Record the data of both and judge whether the ear thermometer is accurate through comparative analysis. If there is a deviation, adjust it according to the calibration specifications.