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The standard calibration temperature is 68°F (20°C), however, many of the hydrometers available to homebrewers are still calibrated to the older 60°F (15.6°C) standard.
References
Brew By The Numbers by Michael Hall (Zymurgy, Vol. 18 No. 2, Summer 1995)
Understanding Specific Gravity and Extract by Martin P. Manning (Brewing Techniques)
New Brewing Lager Beer by Gregory J. Noonan
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© Copyright 1998 Mark Riley, All Rights Reserved.