Zh38 is awesome! specs are mismarked - InfiRay Outdoor Zoom ZH38 640x512 38mm Handheld Thermal Monocular

I don't have a big basis for comparison because my previous thermal was kind of a cheap unit. This thermal from IRAY is the next level. I love the optical zoom and it feels very solid. I can see 747's in the sky flying overhead and small birds perched in trees a few hundred meters away. One of the things that was a little concerning when I bought it was the thermal sensitivity being 50 MK. When I received the unit I looked in the owner's manual and it states that it's 25 MK which is much better. I contacted Irays International customer service and they verified that it is 25 MK. Both Optics Planet and Ira USA have it marked incorrectly. So far I'm very happy.