The 'standard' magnification for a loupe (for jewellery & gemstones, stamps & coins) is 10X.
This one is 30X
The diameter of the lens is 21mm
Too see reviews of loupes, click here
This really is the largest possible strongest possible loupe with the highest quality triplet lens. However, there really are limits as to what can be done technically - the image is crystal sharp in the very centre, most of it is very wobbly.
This said, if you want the largest possible strongest possible loupe with the highest quality triplet lens - this is the one.
Everything you need to know about magnifiers and magnification.
See information about (and reviews of) loupes (small high-power folding jewellers' magnifiers).
Video (electronic) magnifiers, video magnifiers compared.
Products: see pocket microscopes and phone microscopes, click here.
With most magnifiers* magnification and working distance are related. Download our Excel sheet, enter a magnification to see the resulting working distance, enter a working distance to see the resulting magnification.
* excluding surgeons-type, digital & phone magnifiers, and microscopes.