The Refracto 30GS digital refractometer, manufactured by Mettler Toledo, is used to measure the sugar content of liquids. In the diploma thesis, we calculated the device’s standard measurement uncertainty of type A and type B, and eventually defined the expanded measurement uncertainty. We have found out that measuring sugar content in home-made beverages is not accurate because they are made out of several different ingredients. The refractometer accurately measures water-based beverages and dissolved sugar. If other nutrients are dissolved in the beverage then the refractometer shows the sum of all the nutrients totally dissolved in the beverage and not only the sugar.
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