Not a single failure in almost 2 years
During my old good days in the army I could only dream about using thermal vision at such distances. On a clear night it can distinguish a human or a big animal almost a mile away! I had to buy a more powerful rangefinder to measure. When I bought this thermal, I was not sure if I would heavily use it, so I chose a 384 lens as a more budget friendly option. But now I've got so addicted to it!