To separate natural stones from the others and also from imitations.
It measures the refractive index or speed of the light in the stone compared to the speed of the light in the air.
Able to tell if the stone is doubly refractive when given two different values of reading.
Comes in a carrying box.
Comes with light and sample R.I. liquid.
H 1205G - R.I. liquid 1.80 small bottle (about 5ml)
H 1205H - R.I. liquid 1.80 medium bottle (about 7ml)