The entire surface of the forehead is not suitable for measuring the forehead temperature. As the distribution of subcutaneous vessels differs from place to place, we recommend taking the measurement in the center of the forehead with the iHealth PT2L thermometer. Temperatures measured in other areas of the forehead may not be accurate.
Measurement area: In the center of the forehead, at a distance of approximately 1 to 2 cm.
*credit to Tanguy of iHealth Labs EU