refractometer

[donwiggins]

I just bought a refractometer off E-bay that measures in percent instead if S.G. What percent of salt should I be looking for. Thanks.

[Randy Holmes-Farley]

Does it read in ppt, read as o/oo?

Seawater is 35.

Does that fit?

If so, I'd buy a seawater standard (53 mS/cm from Pinpoint = 35 ppt) or make your own (with a good balance) to confirm its accuracy (it will be off if, as expected, it is a salt refractometer (off by 1.7 ppt at 35 ppt)0.


Refractometers and Salinity Measurement
http://reefkeeping.com/issues/2006-12/rhf/index.php

The “How To” Guide to Reef Aquarium Chemistry for Beginners, Part 1: The Salt Water Itself
http://reefkeeping.com/issues/2007-03/rhf/index.php

Reef Aquarium Salinity: Homemade Calibration Standards
http://reefkeeping.com/issues/2004-06/rhf/index.htm

[donwiggins]

Yes, my 125 gal. mixed reef had a reading of 34. I will use your Homemade Calibration Standards to test results. Thank you Randy, Don.

[Randy Holmes-Farley]

You're welcome.

Happy Reefing. :)