Dave - I plan to calibrate it this week with distilled water before brew day.
Goat - I'm not sure how accurate boiled tap water would be as it's the added salts etc that would put your reading out. Anyone compared distilled water to tap water?? How close are they?
dont forget to calibrate the refractometer against your hydrometer.as was advised to me.then theres the temp variation which can be sorted via beersmith and im assuming promash has this feature as well.
I won't be calibrating against my hydrometer , I think mt refractometer is much more accurate than that , still mines a cheap brewing hydro. they only work on the correct amount of lead shot in the bottom.
Calibrate with distiled water we do me
Was standing in my kitchen today. Had thawed a 2l bottle of boiler residue, (which I had originally measured the gravity of) decanted off the break (leaving some malt behind), diluted a bit, boiled it to be a starter and was trying to guess in my head what the resultant gravity of the starter was. Doh! Why not take the merest drop, and measure it? Then, come to think of it, take another drop every 6 hours, plot gravity against time, and select my brewing day from the high krausen time predicted from the graph. Woohoo!
Been playing with my refractometer and have tested my oatmeal stout and got a reading of 7 Brix
With a starting gravity of 1.056 my quick uneducated calculations through promash put the stout at 1.010. Is this right or do I need to change some settings?