I just got one for my B-day but am still trying to see the big benefit. am I correct in saying that you can only convert the initial reading (after boil) to calculate the SG?
A refractometer is calibrated for sugar/water mix only. Therefore it won't give the correct reading in a sugar/water/alcohol mix.
I'm planning on creating a chart over time as I brew by using a hydrometer to take a reading and then using the refractometer. I should be able to make a chart with refractometer readings on the left scale, hydrometer readings on the bottom scale and a line for each original gravity wort. This would allow me to have a conversion reference for future use at each original SG that I brew.
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