Night Vision Anyone know much about these?

Not familiar with the brand nor the supplier, but with a 5 year warranty (as long as the supplier is GTG) I would think it would be hard to go wrong.
 
looks like the warranty excludes the tubes .
also the term , 'surplus tubes' .. is a pretty broad term ? . buyer should just call them and ask .
but guessing.. to me that means maybe ? , some possible contract salvaged from some agency upgrade, and they bought the used tubes at good price, and assembles them with new housing they guarantee.

off there page..
..." and will offer a (5) year warranty on the housing and construction to the original owner no problem! Due to the surplus nature of the tubes, we can't offer a warranty on them ".
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