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Old 05-05-2009, 01:26 PM   #11
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I have a original sea test specific gravity meter that i have always used for my tank and it reads it as 1.021. Is this something totally different than a hydrometer or refractometer?

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Old 05-05-2009, 02:47 PM   #12
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That my friend is a swing arm hydromenter and it is not as accurate as a refractometer.

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hydrometer, refractometer

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