... -effective Portable Digital RefractometerIntroduction&Specifications: WZB R1 Serum And Urine RefractometerThe digital display high precision optical ... corresponding alcohol, beans propeller concentration, urine specific gravity, serum protein, glycol, propylene glycol, battery liquid, etc.Features ... life over than 10000 timesRefractometer Specifications: Measuring Range:SERUM P. (g/dl) 0~12g/dl URINE ...