Blood Serum Protein: 0-12g/dl, Urine Specific Gravity: 1.000-1.050sg, Urine Refractive Index: 1.330RI-1.360RI * Min.Divisions/Accuracy: Blood Serum Protein: 0.2g/dl Urine Specific Gravity: 0.005sg, Urine Refractive Index: 0.0005RI * This unit measures hydration of pets and people! * Solid Construction - 5 year warranty against defects - Economy version of our other unit found on Amazon * The unit has Automatic Temperature Compensation ("ATC") and comes with a case, calibration screwdriver, pipette and users guide