Recently someone on the forum, can't remember who, was expressing great frustration at their inability to focus a scope well enough to see the triches. That got me thinking back through my 1.5 years' experience with different viewers, and how I struggled to figure out how to use them, and what would work best for me. One thing, I have 64 year old eyes, so a good viewing device is a must for me. Another thing is that I can't move my plants around since they are in hydroponic grow boxes.
The triplet loupe is made by the Belarusian Optical Mechanical Association (!!!) Here's the definition of Triplet: "three lenses made of different types of optical glass bonded together and designed that, together straighten out the light that comes into the front of the loupe lens so that it's the same when it leaves. Cheap import triplets are just three identical pieces of glass, not bonded, or even a single piece of glass; they distort the image and don't provide the stated magnification."