Brix is a measure of dissolved solids in a liquid. It was
traditionally used to measure the sugar content of grape juice etc
when making wine and beer. These days it is used to measure many
liquids using a refractometer, which looks like a short telescope with
a glass plate on one end. A drop of juice or plant sap is placed on
the glass plate and then the refractometer is held up to a light
source and you read the Brix by looking through the eyepiece.
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