From my experience, ATC is useless when cold. I bring my refractometer inside these days and keep it in my pocket on brew day. Without this, my numbers were all over the place.
not as problematic as my pH samples which must be cooled to room temp.
Quote from: ynotbrusum on April 23, 2015, 02:07:58 AMnot as problematic as my pH samples which must be cooled to room temp.Little trick-- get your sample, 2-4 oz, in a plastic cup or something, then submerge the bottom in your sanitizer bucket (I always keep 5 gal of StarSan solution around) and swirl. 70F or less in under a minute