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Old 04-16-2013, 03:23 PM   #21
Apr 2012
Cincinnati, Ohio
Posts: 2,378
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Yep. Agreed based on my testing on like 2 batches

Honestly, if I'm off by +/- 0.002 or 0.003 I'm not going to sweat it. Maybe 1% alcohol difference. I don't really care. I just wanted to know it was done and it was okay for that. And I will use it for pre-fermentation now that I got into BIAB.

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Old 04-19-2013, 08:58 AM   #22
Sep 2011
Washington, DC
Posts: 117
Liked 4 Times on 4 Posts

Originally Posted by Yooper View Post
It's the alcohol. Alcohol changes the way light refracts and since that is what a refractometer reads, they are hard to read and inaccurate once fermentation occurs.

This x 2

Use a refractometer for OG and a hydrometer for FG. Alcohol content makes refractometers inaccurate.

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Old 04-19-2013, 12:38 PM   #23
Feb 2005
Hubbardston, MA
Posts: 272
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Morebeer had a spreadsheet on their site to correct fermented refractometer samples and although I don't rely on my refractometer for FG readings the few times I tried it it was right on with my hydrometer sample. No blurry lines either.

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Old 04-19-2013, 12:50 PM   #24
/bɪər nɜrd/
MalFet's Avatar
May 2010
NYC / Kathmandu
Posts: 8,632
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Though alcohol will distort the reading, it shouldn't make it impossible to get a reading. With my refractometer, I have no problem getting a sharp line with wort, both before and after fermentation. If you're consistently getting a blurry line like this, it's likely caused by solids in the liquid that are preventing a good, clean contact between the stage and the plastic cover.
"Be excellent to each other." -Benjamin Franklin

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Old 09-29-2016, 02:52 PM   #25
Apr 2016
Posts: 92
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sorry for digging, but can you correct me? About 2 pictures from 1st post.
1.120 is showed that it is more than 30% Brix where when you use calculator or whatever 30% Brix is around 1.130. What is lying here?
ArdBir and CraftBeerPI PCB's:

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