When using a hydrometer, you need to get a trial jar sample of wort from your Grainfather when it is near boiling and then wait for the wort to cool before getting a reading. With the refractometer you only need to take a small sample using a spoon or pipette straight from the Grainfather and only wait a few seconds before dropping a very small sample on to your refractometer.
(0 to 32% Brix scale. Wort SG: 1.000 ~ 1.120)
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