... : 1.30-1.81, Size: 30x70x130mm. Gem Refractometer CL-181LLGem Tester Refractive index is one of ... instrument used in jewelery market.Gem refractometer CL-181LLDescription: 1)Gem refractometer, glass testing table-board,black color,c/w built-in LED light, 2ml RI liquid,manual; ... .01Size:30×70×130mmNote: 2ml RI liquid may possibly not be shipped owing to air shipping limit. CL-181LL Gem refractometer