The Digital Gem Refractometer GDR800 is a nice optical instrument which will give a reading of the Refractive Index of a clean, flat, well-polished facet to reproducibility of 0.007RI Index Units. With covering the full Range from 1.30 to 2.99RI, It is an ideal instrument to identify the gem st1s. The importance is that it Can test the gem st1s Without requiring ANY messy, damaging contact oil. Specification: -RI Test Range:1.30 to 2.99RI -Power Input: 9V Battery -Work Tempreature: 25-28oC Refractive Index of Some Gemst1 Quartz: 1.544-1.558RI Topaz: 1.63-1.64RI Ruby: 1.74-1.78RI Cubic Zirconia : 2.15-2.18RI Diamond: 2.37-2.46RI With Covering The Full Range From 1.30 to 2.99RI, It Can Test The Gem St1s Without Requiring ANY Messy, Damaging Contact Oil.
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