Gem Refractometer, Hard CZ measuring prism. 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:...

Gem Refractometer, High hardness CZ test prism Scale range:1.35-1.81. Gem Refractometer High hardness CZ test prism Scale range:1.35-1.81              Error:...