refractometer

Though I expect to stay. I bought one of these refractive hydrometers. It has a scale from 0 - 80% alcohol v/v, my pre-fermentation mix measures at 55%. Is there a way to convert this reading to a density measure that can be used for brewing? I have started brewing to get me through the...

Hi All, I have searched all threads relating to refractometers but some are very old and I couldn't quite get all the info I needed. So.. Here are my thoughts - it seems a lot of brewers say that these devices are inaccurate and need a conversion tool for testing the FG. I was wondering if...