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Why is the property temperature measured by infrared temperature measuring gun 27℃ higher? My thermometer shows 23 degrees.

The temperature measured by infrared temperature measuring gun of the property is 27, and my temperature calculation shows that it is 23 because the temperature outside is different from that at home.

The infrared temperature measuring gun of the property measures the outdoor temperature, and brings its own thermometer indoors. According to different environment, the temperature measured by thermometer may be different.