I have been looking through the numerous threads regarding the use of a hydrometer, and, believe it or not, I am still confused. I brewed a graff and took an original gravity reading. It read 64. I think the correct way to read this is 1.064. I got a final gravity reading at the 8 mark, very close to the red line at the top of the hydrometer. Is this 1.08? Having gotten these two figures, both at 68 degrees, how do I go about using these two readings to determine alcohol content? Any help would be greatly appreciated.