Analogue Refractometer KERN ORA 3HBRefractive index measurement for laboratories and the industry The models in the KERN ORA H range are universal, maintenance free analogue manual refractometers The handy and robust design allows the easy, efficient and sustainable use in everyday life These scales are especailly developed, exactly calculated and checked. They are also characterized by their thin and clear lines. The optical system and the prism cover are made of special material