MASTER-RI is refractive-index model.It can be used for measuring the refractive index of vegetable oil, petroleum, oil slicks, etc.
[Refractive Index]
Design Registration No.000379326-0001, 000379326-0002 (EU)
ZL 2005 3 0116403.4,5 (China), D111526 (Taiwan), D555, 549 (U.S.A.),
1255763, 1255764, 1255765, 1255766, 1255767 (Japan)
Patent Granted in countries around the world.
More Info:
https://www.atago.net/product/?l=en&f=products-master-top.php#AHG61843