Is my hydrometer reading incorrectly? - Home Brew Forums
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Old 08-24-2008, 08:38 PM   #1
rockout
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I've been using the same hydrometer for over a year and never really had an issue with it - I always attributed the slightly-off SG readings I got to my beginner's inexperience with making beer.

So with my current Saison Dupont clone, I wasn't that surprised when my starting gravity read about .015 higher than the recipe said it would. Then when the FG was also reading about .020 higher than the recipe specified, I started thinking (usually a bad idea, I know).

So I threw some tap water in there. At room temp, 70 degrees, the hydrometer read 1.007. Okay, but tap water isn't pure water. So I took some bottled spring water (Poland Spring, to be specific). That, at room temp, came in reading 1.005. Also, I've read that most hydrometers read accurate at 60 degrees, and you add .025 for every 10 degrees higher.

Is my hydrometer reading too high?



 
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Old 08-24-2008, 10:10 PM   #2
truckmann
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Hard to say. Spring water is still not pure water. Try distilled water and see what you get.



 
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Old 08-24-2008, 10:17 PM   #3
eddie
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most hydrometers are calibrated to be accurate at 60f. Test it using distilled water at that temp. It should read 1.000. If it doesn't then just make a little mark on it with a magic marker wherever it's reading and adjust your subsequent readings accordingly.

 
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Old 08-24-2008, 10:30 PM   #4
rockout
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where the hell do i get distilled water?

 
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Old 08-24-2008, 10:34 PM   #5
eddie
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You should be able to get it at your grocery store where they sell bottled water in the gallon jugs.

 
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Old 08-24-2008, 10:35 PM   #6
Yooper
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At the store. They have it at the grocery store, Wal-mart, etc. It's about 79 cents a gallon. It's worth it to check the accuracy of your hydrometer, and then you can use the remainder to mix up sanitizer. Distilled water is preferable for star-san.
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Old 08-24-2008, 10:35 PM   #7
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Old 08-24-2008, 10:36 PM   #8
rockout
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Thanks. Guess I never had to look for it before, didn't realize it would be there.



 
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