Specific gravity in brewing is the ratio of the density of the wort to that of water.

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Gravity Measurement Tools

What tools for measuring specific gravity are available to the homebrewer? EG: refractometer, hydrometer. What scale do they measure? EG: Brix, plato Since there hasn't been much activity on the ...
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DIY BrewBug based offerings?

BrewBug, is a neat little toy that essentially has a "floating bob" that measures the temperature and specific gravity of the wort as it is fermenting, allowing for niceties like changing the ...