HuskerCradle2Grave
Big Red in the Big Ten!
Hydrometers are usually calibrated to 60 or 68 degrees. It should say somewhere with the paper that came with it. It should also have a temperature adjustment scale on the same piece of paper. For instance, mine is calibrated to 60 degrees. If the wort or green beer is at a temperature other than that, I need to correct for temperature. An example would be if the green beer was at 66.6 degrees, I would have to add .001 to my reading.