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Home Brew Forums > Home Brewing Beer > Equipment/Sanitation > Making a hydrometer
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Old 01-01-2012, 12:49 AM   #11
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Quote:
Originally Posted by Isometric View Post
So to find the sg I just need to find the density of what I am fermenting , since the density water's density is 1 g/mL. The scale I have measures grams with no decimals, is that ok for finding sg?
Depends on what kind of volume you're talking about. If you are measuring 10 mL and your mass is only in full grams, then no, that's not as accurate as you want. If you're measuring the mass of 1000 mL, then accuracy to the gram is fine. But really it all just depends on how much accuracy you want.

EDIT: Edited cuz of bad math.


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Old 01-01-2012, 09:20 AM   #12
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I would even say 500ml should be good enough, +-2 gravity points


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Old 01-01-2012, 09:32 AM   #13
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It would be pretty expensive to import one to the Dominican Republic apparently.
But getting all the other stuff one needs to brew is a snap?

I think it's just one of those idle thoughts that people often have here on HBT. Trying to DIY something that is cheap, robust, and readily available seems to be a common subject here.
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Old 01-01-2012, 05:54 PM   #14
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USPS first class shipping is only $5 from the states. I have an extra cooper's hydrometer if you're interested. It cost me $10 + $5 to get it shipped to me.

Coopers Beer Making Accessories > Beer Hydrometer
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Old 01-03-2012, 09:06 PM   #15
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and then you just need a container you can fill with wort to the exact same level every time, or a graduated cylinder.
what you want is called a pychnometer, and its essentially a glass flask of known weight and very precise volume. you fill the container to the very top with liquid, then put the glass stopper into it so there are no air bubbles. this gives you a very accurate volume measurement. then you just weigh the whole thing and subtract the container's weight.
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Old 01-03-2012, 10:53 PM   #16
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what you want is called a pychnometer, and its essentially a glass flask of known weight and very precise volume. you fill the container to the very top with liquid, then put the glass stopper into it so there are no air bubbles. this gives you a very accurate volume measurement. then you just weigh the whole thing and subtract the container's weight.
That would certainly do it. But I wager that anyone who didn't want to buy a hydrometer also wouldn't want to buy a pychnometer.

That's a neat looking device tho. I've not seen one of those before.
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Old 02-26-2014, 01:20 AM   #17
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To Make and Calibrate a Homemade Hydrometer
Need: Chewing Gum, Drinking Straw, Distilled Water, Sugar
1) Chew Gum and put on one end of straw so that it is airtight
2) Measure out 100 ml of water and place the hydometer in marking the waterline as 0 Bx or a specific gravity of one
3) Remove hydrometer and add 1 g sugar to distilled water and repete this time marking as 1 Bx
4) Repeat until you reach desired Bx (25 is a specific gravity of 1.1057 or 15%)
(Edit) SG = (Brix / (258.6-((Brix / 258.2)*227.1))) + 1

Reason: Adding Equation
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Old 01-12-2015, 07:32 PM   #18
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http://m.wikihow.com/Build-a-Hydrometer try this method.


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