2 by following thelink.
The image quality during the device
operation at below zero temperatures is
worse than at positive temperatures
Possible cause
In warm climates, objects in the background of a thermal image heat up
differently because of thermal conductivity, generating a high
temperature contrast and a sharper thermal image.
In cold climates, objects in the background of a thermal image will cool
down to roughly the same temperature, which leads to a greatly
reduced temperature contrast and a degraded image quality. This is
normal for all thermal imaging devices.
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