Binocular Headband Magnifier, professional Magnifier Style_Head-worn Used in combination these give

Used in combination these give 30 possible magnifications from 1

A refractometer measures refraction (bending) of light as it passes through the gemstone (like poking a stick into clear water)

Combine 15X with 10X to give 25X

3 of 395 button battery

It's not that this microscope simply

Binocular Headband Magnifier, professional Magnifier Style_Head-worn Used in combination these giveSummary This is the type used by surgeons, instead of 'simple' lenses, they have a pair or very high quality tiny telescopes. This enables a unique combination of high magnification with a long working distance (choose the one that is best for you). Detail The optical quality of these is so good that you do not need high magnification, see our guide. As regards the working distance, sit at your workplace, sit comfortably upright, see how far it is