1, test several times more.
If the temperature gun doesn't allow it, you can measure it several times, or measure the person with normal temperature first and then measure the subject. In addition, when the measured person comes from a place with a large difference from the ambient temperature, he should stay in the measurement environment for at least 5 minutes, and then measure after it is consistent with the ambient temperature, otherwise the measurement result will be affected.
2. Keep the temperature of the temperature gun.
Put the infrared thermometer in a dry incubator with suitable temperature and use it alternately; The infrared thermometer can be placed next to the heating equipment or in clothes to keep warm, and the temperature measuring gun can also be placed in the measured environment for 20 minutes, and then used after it is stably adapted to the ambient temperature.
3. Replace the battery or buy it again
Then, if there is no power in temperature measuring gun or something goes wrong, you need to replace the battery or buy a new temperature measuring gun.