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Old 08-25-2008, 02:07 AM   #21
Bobby_M
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I have two. One is for a salt water aquarium which is calibrated at 68 and the one you see in the video is calibrated for 60F. It's written in small print on the paper scale inside the tube.
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Old 08-25-2008, 02:42 AM   #22
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Moonpile,
Quote:
Actually, if all you want to know is the Specific Gravity of your sample, then the volume is irrelevant. If you want to use that value to calculate efficiency or to figure out how much water to use to dilute to a certain SG, then, yes, you need an accurate volume.
You are correct.

The whole point of my response was that even though you take a reading of the wort if you then use volumes that are not correct you will get false OG, FG For alcohol or efficiency calculations. What would be any other point of taking a reading anyway?

Edit: You do not need to know volume for alcohol calculations.
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Old 08-25-2008, 04:39 AM   #23
rdbeer
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Mine reads 1.006 in distilled water at the calibration temperature. I've had only one hydrometer out of 4 that has worked correctly and been accurate. The others were leaked, were cracked, or were way off. Of course I broke the one that worked like it was supposed to
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Old 08-25-2008, 02:47 PM   #24
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I only use mine after I brew to see the reading after cooling and treat it like it was the last one in the world. I made a box that I keep it in so it won't get cracked and only use it in the Hydo tube, wash and dry and put it back in there. If you leave it laying around then all bets are off.
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Fermentor 1: Bill's House Ale II, Fermentor 2: German Helles, Fermentor 3: Bill's Schworzbier (Black Bier)
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Old 08-27-2008, 12:48 AM   #25
stonenic
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Quote:
Originally Posted by WBC View Post
Moonpile,


You are correct.

The whole point of my response was that even though you take a reading of the wort if you then use volumes that are not correct you will get false OG, FG For alcohol or efficiency calculations. What would be any other point of taking a reading anyway?

I've always just used ABV = (OG-FG) x 105 x 1.25 I've never used any volumes. How are you calculating your ABV?
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Old 08-27-2008, 12:50 AM   #26
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Are there any electronic hydrometers?

 
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Old 08-27-2008, 02:59 AM   #27
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IIRC There was a BYO article awhile back with a method of calculating SG by weighing a sample. You did need a pretty precise volume though. I'll have to root around my back issues.

 
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Old 08-27-2008, 05:24 AM   #28
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Quote:
Originally Posted by stonenic View Post
I've always just used ABV = (OG-FG) x 105 x 1.25 I've never used any volumes. How are you calculating your ABV?
Ok you got me. I guess I got a little too excited. You don't need volume for alcohol, I stand corrected but you sure do for efficiency calculations.

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Fermentor 1: Bill's House Ale II, Fermentor 2: German Helles, Fermentor 3: Bill's Schworzbier (Black Bier)
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Old 03-27-2009, 06:31 PM   #29
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since hydrometers come in various ranges you could get a hydro for measuring OG and a different one for FG readings. They narrower range provides an elongated scale which is easier to read.

You could have a hydro for High Gravity Beers or any other style....

http://vwrlabshop.com/vwr-precision-...ers/p/0009308/
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Old 03-27-2009, 06:33 PM   #30
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Quote:
Originally Posted by MrManTX View Post
Are there any electronic hydrometers?
Yeah, what happened to the guy that was making some sort of USB Hydro on here? I'm ready to order one!
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