Do yourself a favor and skip this loupe
- Familiarity: I've used it several times
This loupe will provide clear 10x magnification in the controlled environment of your home. Take it out into the cold and wet backcountry and it will not.
I experienced persistent fog and water smears with this thing, and it's extremely difficult to unfurl with any sort of glove on. It's also tiny and provides no way of focusing short of pulling the magnifier back on its hinge and manually changing the distance between it and the object being viewed (which is fine, but renders the millimeter measurements useless).
I recommend a higher power magnification unit with an adjustable focus knob if snow crystal ID is your objective.