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Sper Scientific 300005 Refractometer 024185733102 weather you are going toBrand Sper Scientific Model 300005 Sper Scientific 300005 Refractometer Clinical measures urine specific gravity, or gives the refractive index in seconds Refractive Index Urine Specific Gravity Refractometer Clinical Refractometer measures urine specific gravity, or gives the refractive index in seconds. Dimensions Place a drop or two of a sample on the prism and read the results. Sper Scientific portable refractometers work in ambient light with no