and Wayne is correct or with standards and here is a link


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


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"Wayne Sallee" wrote in message
...
: Cindy wrote on 6/6/2006 4:05 PM:
:
: And what do I calibrate it to?
:
: A salinity monitor, or refractometer.
:
: Wayne Sallee
: Wayne's Pets
: