Digital Digital medical instrument specific gravity refractometer Model: DR501 Brand: Yucheng City Tianyuan Xin Branch Optical Instrument Co. Measuring range: 0.1 ~ 12g / dl serum protein specific gravity 1.000 ~ 1.050sg refractive index of 1.3330 ~ 1.3900ND smallest scale: 0.1 g / dl serum protein 0.001sg specific gravity 0.0001ND refractive index with automatic temperature compensation Operating temperature: 0-40 ℃ (32-104 ° F) Storage temperature: 10-50 ℃ (14-122 ° F) Power supply: 1 battery (1.5v) power is not enough to automatically turn off the automatic temperature compensation Fahrenheit, Celsius conversion medical digital refractometer, urine specific gravity concentration meter / serum protein refractometer can accurately and rapidly measure the levels of human and animal physiological fluid, three scales were measured specific gravity, serum protein and refractive index. The product is simple in structure, easy to carry and operate, clear vision, hospitals, research institutes and veterinary industries indispensable testing equipment. Measuring Scale Model No. Measurement Range Resolution Accuracy DR501 URINE SP. G. specific gravity S01 1.000-1.050 0.001 ± 0.002 SERUM P. serum protein S02 -0.1-12.0 0.1 ± 0.2 Refractive Index refractive S03 1.3330--1.3900nD 0.0001 nD ± 0.0003nD