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Is hydrometer calibration linear?

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nateo:
My hydrometer (apparently) lost its calibration somehow. I know I checked it a year or two ago, and it was correct, but I checked it today in 60*F water and got 1.005. Do I just subtract 5 points off any measurement? Why/how would a hydrometer lose its calibration?

a10t2:
The only thing that can really go wrong is for the paper inside to slip up or down the tube. Check to see if the little bead(s) of glue are intact.

If that's the case, then the correction would be linear.

redbeerman:

--- Quote from: a10t2 on January 10, 2013, 06:10:49 pm ---The only thing that can really go wrong is for the paper inside to slip up or down the tube. Check to see if the little bead(s) of glue are intact.

If that's the case, then the correction would be linear.

--- End quote ---

I have had this happen.  The correction is linear.

Titanium Brewing:

--- Quote from: nateo on January 10, 2013, 05:35:36 pm ---My hydrometer (apparently) lost its calibration somehow. I know I checked it a year or two ago, and it was correct, but I checked it today in 60*F water and got 1.005. Do I just subtract 5 points off any measurement? Why/how would a hydrometer lose its calibration?

--- End quote ---

You use distilled water, correct?

a10t2:

--- Quote from: Titanium Brewing on January 17, 2013, 01:43:31 pm ---You use distilled water, correct?
--- End quote ---

It doesn't matter. Tap water with a TDS high enough to be measured using a hydrometer is a couple orders of magnitude outside the EPA limits.

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