Well, a satellite fermenter is when you take a sample and take a hydrometer reading then Pour the sample into an old beer bottle, place a paper towel in the neck & locate it next to your fermenter. This is called a satellite fermenter. It is used to take hydrometer readings without opening the fermenter. If the satellite becomes infected, the readings are still accurate.
It says that the readings are still accurate but are they? any one had past exp?
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