RHC-300ATC Clinical refractometers for Clinical Usage(Veterinary and Human) The Clinical refractometers are designed for clinical usage and intended for both Veterinary and Human. Triple scale that gives Urine Specific Gravity(SG.) Total Serum Protein(SP) and Refractive index(RI) Equipped with scale measurement which provides direct reading,Easy to focus and calibrate. Uses ambient light only which means battery or power source is not required. Heavy-duty and lightweight with its aluminum construction.