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Why is the indicated temperature on the forehead thermometer rather high?

Why is the indicated temperature on the forehead thermometer rather high?

– The unit has been stored in a cold room. When the unit has been stored in a cold room, the measured temperature may be rather high if you measure the temperature shortly after bringing the unit to a room that is at normal temperature. Measure temperature after leaving the unit for 30 minutes in the room where it will be used. It is advisable to store the unit in the room where you are going to measure temperature.
– The probe lens has been exposed to direct sunlight.
– Measurement was taken shortly after the subject cried.
– Crying can increase facial temperature.