This instrument measures the refractive indices nD and mean dispersions nF-nc or transparent and translucent
liquid or solid, mainly transparent liquid. By attaching a thermostat to this instrument, the refractive indices nD
within the range of temperature 0 to 70 degrees can be measured.

Refractive indices and mean dispersions belong to one of the important optical constants in substance, which
can be used to determine the optical performance, purity, concentration and dispersion, etc. The instrument is
capable of determining the percentage of sugar content in saccharose solution (0 to 95 percent, equal to
refractive indices 1.333-1.531). Therefore, this instrument can be widely used as one of the indispensable tools
in petroical, oil, fat, pharmaceutical, paint, food, chemical and sugarmaking industries as well as in
factories, colleges, and research institutes concerned with geoical survey.