Boomer wrote:
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


Well thank you, cause if I had a refractometer, I wouldn't need to
calibrate the Seatest. Guess I should have asked the question better.
Or Googled.