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Old 08-17-2013, 04:03 AM   #1
The_Mad_Scientist
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Default Lesson Learned

So....like a lot of us I have 2 hydrometers incase one breaks...which well has happened a time or two.

Now comes my lesson, use the same hydrometer for all your readings though out the fermentation. Using the same sample the difference between the two hydrometers is .015 (give or take a little).

It only took me 2 months to figure out why my efficiency has been all over the place using the same equipment and same process. Not to mention when you are trying to get a final gravity reading.

I have marked one now to tell the difference, but one of these days I really should switch to a refractometer.


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Old 08-17-2013, 04:10 AM   #2
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I have two hydrometers. One reads .002 high, the other .002 low. I marked each one and compensate for the error.

I love my refractometer when doing AG batches. Once the batch is in the fermenter, however, I put it away in its zippered pouch and use the hydrometers. Even with the alcohol correction calculations, I'm not confident that I can get an accurate reading with the refractometer.


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Old 08-17-2013, 03:14 PM   #3
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Quote:
Originally Posted by The_Mad_Scientist
Using the same sample the difference between the two hydrometers is .015 (give or take a little).
Wow, never seen one off so badly. So one will read 1.050, and the other 1.065?? Is this temp corrected?

What do they read in distilled water?
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Old 08-17-2013, 03:56 PM   #4
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Quote:
Originally Posted by GotPushrods View Post
Wow, never seen one off so badly. So one will read 1.050, and the other 1.065?? Is this temp corrected?

What do they read in distilled water?
Yep...if one will read 1.050 the other will be in the 1.064-1.066. in distilled water.. one reads .095 and the other 1.007-1.010 I have noticed that one tends to very in its readings...where the other pretty much is rock solid...a little off but solid.
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Old 08-17-2013, 04:01 PM   #5
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If they are different by .015 I would try to find out if one is accurate and intentionally break the bad one. That is too big an error for me.
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Old 08-17-2013, 11:31 PM   #6
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I've seen the paper inside slip down , that was just wonderful trying to
figure out why everything was off...
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Old 08-18-2013, 06:02 AM   #7
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I am guessing there must be some form of manufacturing error....they are relatively cheap equipment... So my bet is quality control is not as tight as commercial lab equipment.

I will end up only using the one that keeps a consistent reading and manually correct


anyone want a slightly used refractometer cheap


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