hbr2547 said:So not sure what's the use? Only OG or am I missing something. I've always counted on hydrometer and refractometer way off so I guess use hydrometer for FG and refractometer for OG?
You can use the refractor - you just need to adjust for the alcohol:
Formula for compensation of ethanol effect on refractometer:
SG=1.001843-0.002318474(OB)-0.000007775(OB^2)-0.000000034(OB^3)+0.00574(AB) +0.00003344(AB^2)+0.000000086(AB^3)
SG = Specific Gravity, OB = Original Brix, AB = Actual Brix (Brix Readings During Fermentation)