Optical refractometer ,gem refractometer,gemological test tools factory

1.High hardness CZ test prism Scale range:1.35-1.81

2.Error: ±0.003 Aluminum alloy,easy to clean

3.By advanced optic system,shadow edge is straight and sharp,easy to read it

4.There are two ways of inputing the voltage:7batteries and DC3V direct current suply(AC100-240V).

5.2ml refractive index Liquid(1.78±0.005) with unique design of the bottle(Proprietary technology ZL200620096730.7)

It is much safer ,much ecnomical and more convinent.