Randy Holmes-Farley
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I'm not sure which is off, but just a note: the Sybon does not appear to be a true seawater refractometer, So be sure to not rely on calibration of it with RO/DI or it will likely be off.
You can make your own standards for both devices here. You can also cross check them in each others solutions:
Reef Aquarium Salinity: Homemade Calibration Standards by Randy Holmes-Farley - Reefkeeping.com
You can make your own standards for both devices here. You can also cross check them in each others solutions:
Reef Aquarium Salinity: Homemade Calibration Standards by Randy Holmes-Farley - Reefkeeping.com