The measuring sensor detects the infrared radiation emanating from the eardrum or the frontal surface and reproduces the measurement result during the ear measurement in one second. For forehead measurement, the thermometer displays the highest recognized measurement value after completion of the scanning process.

The reading can be carried out in the right or left ear. The thermometer measures the infrared rays emitted by the eardrum and the ear canal. These rays are collected by the sensor and converted into temperature values. The best results are obtained when the infrared rays are collected from the middle ear (eardrum). Rays emitted by surrounding tissue give lower readings.