The Goldberg TS Meter refractometer is a high precision handheld clinical refractometer that determines urine specific gravity, protein concentration in plasma or serum, and total solids in other aqueous solutions. Automatic temperature compensation provides accurate, reproducible results instantly using our exclusive hermetically sealed, liquid-filled prism that changes index with temperature. The TS Meter provides readings with a degree of accuracy, reproducibility and speed significantly better than those obtained with urinometers or with non-temperature compensated instruments. Accuracy and reproducibility are comparable to those of more costly benchtop Abbe refractometers. No other handheld refractometer offers such an exacting and precise compensation method.