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Hi Yogi, I did add water to adjust the pre-boil gravity to my target. The pre-biol gravity measurement showed me that my total gravity point value was too high by about 10%. So I adjusted the volume to get my intended pre-boil gravity. After the boil and using the post-boil volume in the...

MHB These are also good points. I have checked my refractometer with water and it seems OK. The readings check out with my hydrometer also. My pre-boil and post boil volumes were taken at different temperatures so there could very well be some error accumulating there so I 'll have a look at...

You have some good points there Maxt. The couple of points I'm normally off by could be just my calculations (I'll take a closer look).

I agree this sounds strange. I'm not topping up the volume during the boil, so I suspect that the adjustment I made before the boil made the pre-boil gravity too low. I know what the evaporation loss for my system is, so the post boil gravity would also be too low. Maybe I should do as others...

Hi All, This is my first post on AHB and as a new AG brewer I'm pretty impressed with the level of expertise and knowledge of all things brewing shown here. I've been missing my target OG values by a couple of points so to track down whats happening I started taking pre-boil gravity...