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Old 12-14-2011, 06:59 PM   #11
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I recall a time when I tested a water sample with a refractometer (the instrument was calibrated weekly with 53.0 mS/1.0264 SG calibration fluid) and it registered a reading of 1.016 SG...a swing arm hydrometer measured the same water at 1.022 SG. Prior to the refractometer's reading, the owner of this water sample and hydrometer couldn't fathom why the only corals that didn't die in his tank were mushrooms.

Rift Lake and Reef tanks.
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Old 12-14-2011, 09:27 PM   #12
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Hydrometer readings are very much influenced by temp. It's an extra variable. I'd use one for a mudskipper tank, but not a true SW tank (reef or FOWLR). All comes down to personally accepted risk / accepted effort.

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Old 12-14-2011, 10:25 PM   #13
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Mine has ATC, thats why I chose it.

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gravity, refractometer, spec, specific gravity, tester

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