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Old 01-26-2010, 12:38 PM   #11
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RO/DI water will calibrate it for use with saltwater (saline solution), except we use seawater. To accurately calibrate it at 35 ppt (1.026) you need to use a calibration fluid.
If you calibrated with RO water, you will read a little higher than it actually is. If you see 35 ppt, it's more like 33-34 ppt.

Very good article on calibration here.
Reef Aquarium Salinity: Homemade Calibration Standards by Randy Holmes-Farley - Reefkeeping.com

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Old 01-26-2010, 03:50 PM   #12
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Great Article. Thanks so much.

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Old 01-27-2010, 10:19 AM   #13
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There is BIG difference between RO water and RODI water. If you are using RODI water that is at 0 tds then there is no difference between using that and distilled water for calibration. But that's calibration at 0. To be sure you should always test using some standard calibration fluid (about $5) or make your own per the instruction in the linked article.

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