Product Details  1.Refractometer, are widely used in laboratory 2.refractometer(lab instrument, digital thermometer )  refractometer(lab instrument, digital thermometer ) A refractometer is an instrument that can measure the concentration of aqueous solution by measuring it's refractive index. All water based solution can make lightbend. The bending of light increases at a rate proportional to the increasingsolution concentration. The hand-held refractometer is a precise optical instrument. It is characterized by small volume, light weight, graceful shape and easy to operate. Therefore itcan be used by all sides.