check to see what attenuation the manufacture states
So let’s assume that it is for want of a better number 77% attenuation
Sorry for other pissy post
Now if you can get your head around the math side of things subtract the 10 from the reading of 1047
Use the residual of 100% minus 77% = 23%
Take your original gravity say 1047 (use the last two numbers of the reading) and multiply it by .23 to obtain your expected terminal reading
47 x .23= 10.81 now add the 10 back to the equation
to get 1010 as read off the hydrometer
the last brew that I did started @ 1075 finished @ 1019
adopt the same formula remove the 10
subtract 19 from 75 divide the result by 75
yeast attenuation is equal to 74.6%
sorry for last confusing post
hope that this brings some light on brew blackmagic
these are only my observations of readings taken from my brew experience and are only an indicative approach to yeast attenuation from me?
please forgive any other nonfrementables in the brew reading as it will still at the end of the brew be nonfermentable