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Old 02-10-2010, 06:03 PM   #1
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Default Quality hydrometer

So, i've decided that my hydrometer is garbage.

Can anyone recommend a decent one?


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Old 02-10-2010, 09:46 PM   #2
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Other than going with a refactometer....are there any other kind than the skinny glass hydormeter? Other than scale, all the ones I've bought are basically the same.


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Old 02-10-2010, 11:23 PM   #3
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Yes here's a quality one. Fragile but very accurate. I made my own calibration plot with sucrose solutions of known concentrations and yes it's dead balls on every time. It also comes with a certificate of calibration (NIST standard as I recall).

http://www.fishersci.com/wps/portal/ITEMDETAIL?ru=http://prodwcsserver:9060/webapp/wcs/stores/servlet/FisherItemDisplay&catalogId=29101&productId=320286 6&parentProductId=650181&langId=-1&distype=0&fromCat=[Ljava.lang.String;@f18010&catCode=SE_SC&brCategory Id=null&highlightProductsItemsFlag=Y&fromSearch=Y& fromProductCatalogPage=Y&crossRefPartNo=null&cross RefData=null
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Old 02-10-2010, 11:34 PM   #4
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Garbage how?

If it's not completely accurate you can measure it and then figure out how much it is off.

http://www.byo.com/stories/projects-...ter-techniques
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Old 02-10-2010, 11:57 PM   #5
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55 bucks for a hydrometer?....Holy Bat Crap Batman!..... How exact do you need the thing to be? Your making beer not atom bombs!!!
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Old 02-11-2010, 12:01 AM   #6
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They cost 25 if you have an account. So 10 bucks more than the LBHS POS ones. Well worth it for something you can trust. And besides, I'm a chemical engineer by trade so I can't justify saving 10 bucks for a hydrometer you have to check the value against a correction table to get the correct value every time.

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Old 02-11-2010, 12:49 AM   #7
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i have a few complaints about this one:

1st, and this might be my ignorance, it says on the piece of paper it's calibrated at 68F. But on the actual hydrometer it reads "Sp.Gr. 60F / 60F". Doesn't that mean it's calibrated at 60F?

Also, do i read the upper meniscus? In distilled water especially, the different between the lower meniscus and upper is about 5 points. Also, the "climb" of the upper meniscus accounts for about 2 points. So i'm not sure if i'm supposed to read the top of the meniscus or the top of the climb.
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Old 02-11-2010, 01:14 AM   #8
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Quote:
Originally Posted by motobrewer View Post
i have a few complaints about this one:

1st, and this might be my ignorance, it says on the piece of paper it's calibrated at 68F. But on the actual hydrometer it reads "Sp.Gr. 60F / 60F". Doesn't that mean it's calibrated at 60F?

Also, do i read the upper meniscus? In distilled water especially, the different between the lower meniscus and upper is about 5 points. Also, the "climb" of the upper meniscus accounts for about 2 points. So i'm not sure if i'm supposed to read the top of the meniscus or the top of the climb.
Bottom of the climb and it's usually calibrated at 60F.
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Old 02-11-2010, 01:37 AM   #9
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Quote:
Originally Posted by Irrenarzt View Post
They cost 25 if you have an account. So 10 bucks more than the LBHS POS ones. Well worth it for something you can trust. And besides, I'm a chemical engineer by trade so I can't justify saving 10 bucks for a hydrometer you have to check the value against a correction table to get the correct value every time.
They're under 7 bucks at my LHBS. Too much for my blood, but since your a chemical engineer you have a right to be anal about stuff like that.
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Old 02-11-2010, 02:53 AM   #10
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If I spend 55 bucks on a hydrometer, I'd better get a happy ending.


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