Gemological refractometer,gem refractometer,gemological tester

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

2) Error: ±0.002 Stainless steel table,easy to clean

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

4) There are two ways of inputing the voltage:2x AAA batteries and DC3V direct current suply(AC100240V).

5) 2ml refractive index Liquid(1.78±0.005) with unique design of the bottle(Proprietary technology ZL200620096730.7)