The problem is that doesn't account for the ethanol if it's a finished wine or mead. Sugar makes the hydrometer float higher than pure water, ethanol makes it float lower, so unless you know exactly how much ethanol's in your solution you can't really figure out the sugar that way with any accuracy...
Originally Posted by vulcan500rider
"The main ingredient needed is 'time' followed closely by 'patience'." - The Bishop 2013
"When you consider that laziness and procrastination are the fundamentals of great mead, it is a miracle that the mazer cup happens." Medsen Fey, 2014
"Sure it can be done. I've never heard of it, but I do things I've never heard if all the time. That is the beauty of being a brewer!" - Loveofrose, 2014
"I tend to....um, er, experiment, and go outside the box. Sometimes outside the whole department store." - Ebonhawk, 2014