Quality control in the field can be done by the farmer using an inexpensive refractometer. A few drops of sap or plant juice are placed on the sloping end under the clear cover.Looking through the eyepiece towards the light, the intersection of the blue and white gives a reading off the scale in °Brix (%sucrose). The higher the reading the higher the sugar content for any given species. High sugar content also means higher protein, higher minerals and greater density. The higher the figure the more nutitious and sweeter tasting
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