Changes

The most common type of hydrometer sold for brewing is calibrated for use on water at temperature of 60 F. If the beer you are measuring is at a different temperature, you need to make an adjustment. You can perform this calculation with a brewing calculator such as [http://www.beersmith.com BeerSmith] or you can use a hydrometer adjustment table such as [http://www.ebrew.com/primarynews/ct_hydrometer_temp_correction.htm this one].