Binocular surgeon's-type magnifier, clips to spectacles Select size: magnification - working distance (WD):3.5X -mag. / 42cm working distance Disclaimer

Disclaimer

ie it won't tell you what the stone is

see all the stones with the same refractive index

YAG (Yttrium  Aluminium Garnet)

Binocular surgeon's-type magnifier, clips to spectacles Select size: magnification - working distance (WD):3.5X -mag. / 42cm working distance DisclaimerSummary These clip to any spectacles, 2. 5X magnification or 3. 5X magnification. Comments This is the type used by dentists and surgeons, exceptionally high quality. Instead of 'simple' lenses, these lenses are, in effect, two very high quality (tiny) telescopes. which means: a combination of magnification with a long working distance (42cm). Sit (or stand) at a comfortable distance from the object No need to get close (3 or 4 inches with a standard