I know there are a lot of threads already about similar issues, but after lots of searching, I couldn’t find an answer.
My refractometer is quite off from my hydrometer. After about 50 extract brews, I’m on my third AG brew and trying to work things out. Two brews ago, I realized things were way off, so I took measurements with my hydrometer and refractometer to compare. I have since read about wort calibration. That seems to make the refract. reading lower. All my hydro readings were higher, after temp conversion. I have the Brix/SG model from NB. Below are my comparisons.
1st runnings - Refract=1.054 - Hydro=1.057
Sparge - Refract=1.031 - Hydro=1.036
Into Fermenter - Refract=1.048 - Hydro=1.056
As for process, I can’t say for certain I let it sit for 30 seconds, but I more than likely re-checked the sample. The outside temps that day were in the mid to upper 80’s. I see the upper temps on the ATC models are 86.
I checked the hydro and refract with distilled water tonight, and they were both very close to being right on (within 0.001 or 0.002).
I’m beating my head against my desk trying to figure this out. Any help would be appreciated!