This is the Abbe Rerfactometer for liquid sample measurement only.
It has the Refractive Index Scale and the BRIX scale, and it comes with D line (589nm) light source. Calibration can be done with distilled water.
Product information
Model
NAR-1T LIQUID
Cat.No.
1211
Range
Refractive index (nD) : 1.3000 to 1.7000 Brix : 0.0 to 95.0%