Finds warm electrical lines and breakers with ease indicating a potential overload.
Originally bought this for hunting at night and finding downed game such as deer after dark. The sensitivity is best when the outside temperature is cold. as the day warms rocks and trees become the same ambient temperature of items / game you are looking for making it difficult to seperate real targets from natural. When the temperature is cold +32 degrees you can identify something as small as a pile of manure freshly dropped by a cow. Amazingly it looks the same as a newborn calf at 150 yards.
A dead deer remains identifiable easily 12 hours after death . these targets show up behind branches and some green vegetation where you can't see them visually even in the daylight assuming the ambient temperature is different than your target.
Con: It appears this is an auto balance device which sets the sensitivity based on the average of the entire scene. having half of the scene you are viewing sky is not what works. additionally, switching to 2X magnification does not change the sensitivity as it apparently is still using the full view of the device and not just what you see at 2X.
All in all works as advertized.
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