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Old 01-07-2012, 09:16 PM   #1
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What are these?

What are these and what are they for

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Old 01-07-2012, 09:20 PM   #2
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Those are hydrometers, for measuring specific gravity. Not all that accurate, when compared to a refractometer.
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Old 01-07-2012, 09:21 PM   #3
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What's tht? And y do u have to have it?
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Old 01-07-2012, 09:24 PM   #4
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hydrometer
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