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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.
