I am a craftsman and repairman. I installed this viewer at the back door of the doctor's office that leads to the back parking lot. I believe that this viewer has both strong pluses and strong minuses. I ended up having to buy a second viewer (partially my fault) after a major failure of the first one. Think; I wouldn't install a second time if I didn't think the end product was worth it. Pros: - The viewer works well (clear view, wide angle, large viewing aperture, inner cover of the viewer) - Quality materials - It's well made apart from two design flaws that I think are the most important. Cons: - Cons 1: (2) The external viewer lenses fit loosely in the mounting flange and do not seal well against the elements (rain). This was not visible during the "first" installation. = I found out about this after a doctor noticed water droplets in the viewer a few days later (it had rained the day before). Loose lenses became visible when the viewer removed. The display cylinder consists of three parts: an inner flange, an outer flange and a threaded center sleeve onto which both flanges screw. The cylinder holds the outer lenses (2 stacks) in the outer flange but not tight enough to create a seal. When the viewer first arrived its internal flange was loose and appeared to be the only option for disassembly (no instructions). When I removed the viewer from the door for repairs, the barrel's outer flange came loose instead of the inner, and the outer lenses slid out of the flange and smashed on the concrete below (though I believe this was partly my fault, as I didn't have any). way of knowing the lenses would come out). = Examination by a second observer confirmed loose/leaking outer lenses even with the outer flange screwed tightly onto the threaded housing. = Correction: Rather than give up (I love the viewer) I used a "very thin" lexel bead to seal/glue the outer lens to the outer flange. I placed the bead by rolling the kebab stick into the Lexel chute, then rolling the stick slightly into the flange hole where the lenses would sit to transfer a "very small" amount onto the inside edge. I then "carefullyβ put the lenses in (to avoid smearing the lexel on the outer lens), screwed in the threaded barrel and allowed to cure for 24 hours before installing the viewing window in the door. Since then we have had several days of rain and no further complaints of flooding. = To clear up any questions about other sources of water ingress: + I used a proper TOGU hole saw to ensure the hole was the right size. + It is a steel door filled with foam. I covered the inside of the hole with silicone sealant and put a bead of sealant under the flanges to keep water out of the door cavity and viewing window. - Drawback 2: The first viewer I got didn't have any slots/slots on the inner flange face for a flat thin rod (metal ruler/edge of a 5-in-1 tool) to pass through, which would provide a way to screw the flanges onto the threaded shank. Instead I had to use pliers inside and outside the door to tighten the flanges (difficult due to the low profile of the flanges). I tried tape on the lips to protect the finish but I still got scratches. However, the second viewer had slots/slots and was easier to install. It was worth it? For me it's all in the final product, but I'll leave that to the UI.
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