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Old 01-28-2016, 10:29 AM   #11
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If that's the case, then wouldn't you want to measure it at the temperature your tank is at?

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Old 01-28-2016, 10:48 AM   #12
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Ideally yes, but we have no control over what temp the hydrometer was calibrated at/for, so we have to make adjustments.
Many refractometers have integrated temp calibration, mine does.
Otherwise you can use charts to determine the specific gravity at various temps.
here is some more info;

Temperature Corrections for Hydrometers by Randy Holmes-Farley - Reefkeeping.com

Salinity and specific gravity guidelines for the saltwater and reef keeper - Algone

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