Gem Refractometer

1. Hard CZ measuring prism.
2. Scale range: 1.35-1.85.
3. Accuracy: +/-0.003
4. Optical design. Aluminum alloy table.
5. Internally installed the monochromatic light.
6. There are two ways of inputing the voltage: 7batteries and DC3V direct current suply(AC100_240V).
7. 2ml refractometer oil(1.78+/-0.005) with unique design of the bottle(Proprietary technology ZL200620096730.7).
8. It is much safer, much ecnomical and more convinent