A U.S.A online gun retailer, has published an excellent article explaining the differences between each generation of night vision gear.
Here’s your crash course in NVGs. Night vision technology is broken up into different levels. Gen 1 night vision is the gear you buy at Wal-mart for $500. Gen 2 costs a lot more and is widely used in the law enforcement sector. Gen 3 is what our military uses. Gen 4 is scary cool and the price of a Rolex.
While this article is about night vision devices for military use, the description of the characteristics of each generation and their associated costs is good background information for the Investigator contemplating the purchase of a night vision device for surveillance use.
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