Iv just got myself a 0-32% refractometer , & without a current brew to take a few samples along the way Iv just been pumping a few figures into promash to see what comes up :wha: Q1, I have calibrated it with distilled water to 0 Brix, What is Brix corection factor? how can there be a difference in accuracy between (asuming both instruments are accurate)a hydrometer & a refractometer reading? it says a typical difference value is .002 to .008 SG. & do I really need to do this calibration after all Im not looking to get accuracy to customs & excise proportions. :wha: Q2,I understand that you have to compensate for the alcohol content in fermented wort when using a Brix refractometer, but assuming I have brewed a beer & say, not taken an OG reading , am I right in thinking that after taking a Brix refractometer reading & an FG hydrometer reading of fermented wort, & after entering these figures into the calculator in promash the % ABV & OG figure is correct? Im just curious how its worked this out?