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NVGs amplify light ans on no lume nights ou need an illumiator to flood the area to see objects.
I prefer the FLIR that is hand held. They can be adjusted to compinsate for the different thermal signatures. The one we use has RCA outputs and we attach a sony recorder that runs on battery or vehicle power.
We have also used marine versions to spot people in the water or detect activity on a boat as we approach.
FLIR. FLIR!!!!!!!
Just my 2 cents
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