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Old 01-12-2010, 01:39 AM   #1
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Default I can't believe I never thought of this before

I know how to calibrate my thermometers-place into an ice water slurry hit the "Calibrate" button on my digital, manually turn the dial to 32F on my analog.

That was the setup, here's the rub:

How do you "calibrate" a hydrometer? You place it into 60F distilled water. If it reads 1.000, you're good. If it's off, then what? You've got a bum hydrometer. You can't actually "calibrate" it now, can you?


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Old 01-12-2010, 01:49 AM   #2
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You note how much its off. Every time you take a reading, add or subtract that much.


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Old 01-12-2010, 01:53 AM   #3
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Quote:
Originally Posted by Edcculus View Post
You note how much its off. Every time you take a reading, add or subtract that much.
Yeah, that's the only answer I came up with. I guess my point was that you can't really calibrate it or "zero it". It doesn't matter in my case anyway, because my old hydro works fine, and I just picked up a new "precision" hydro that reads from 1.000 to 1.080. It should make my SG readings a little more accurate.
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Old 01-12-2010, 01:54 AM   #4
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buy a refractometer?
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Old 01-12-2010, 02:12 AM   #5
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Maybe they're full of shvt, but my LHBS told me they could calibrate my hydro.
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Old 01-12-2010, 02:29 AM   #6
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I got one of the unbreakable hydrometers (plastic) comes with a weight you add to the bottom to measure higher gravity (markings on one side) so it is really accurate. It was a little heavy when I got it so I kept clipping off plastic until it read 1.000 in distilled water. (It has a place at the top marked with lines to do specifically this)

If your glass hydrometer is a little light you could put dabs of epoxy on it until it is calibrated.
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Old 01-12-2010, 09:34 AM   #7
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Quote:
Originally Posted by Edcculus View Post
You note how much its off. Every time you take a reading, add or subtract that much.
Exactly correct.
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Old 01-15-2010, 05:15 AM   #8
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Quote:
Originally Posted by KayaBrew View Post
...You can't actually "calibrate" it now, can you?
Only Criss Angel can do that.
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Old 01-15-2010, 03:04 PM   #9
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Marking an offset is one method of calibration. It's the only method available if the instrument cannot be adjusted.
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Old 01-15-2010, 03:47 PM   #10
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I've calibrated my standard LHBS glass hydrometer by carefully tapping the appropriate end against a countertop thus moving the paper insert. Don't blame me if you break yours though!


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