Ear temperature measurements are considered more accurate than forehead temperature measurements because different parts of the body have varying temperatures. Ear temperature is closer to the true internal body temperature, while forehead temperature can be influenced by various factors such as outdoor sunlight and indoor air conditioning. The U.S. FDA also provides guidance that forehead temperature measurements can be more easily affected by environmental and operational factors. medisana infrared thermometers have undergone rigorous testing, and the accuracy of both ear and forehead temperature measurements under laboratory conditions (fixed room temperature and object temperature) is within ±0.2°C.