Areometer. I work in a brewery. I can't afford a set of laboratory hydrometers for a brewery. It's the next best thing. I love the right temperature. The only advice I have is to buy a bulb kit instead of a single hydrometer. I bought it on my own and only bought one bottle after dying of alcohol. Glass doesn't care about pure alcohol like my plastic glass does. For reference, breweries have a much higher resolution. This is not a single hydrometer, but a set of 3. 1-8P, 8-16P, 16-24P.
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