Quote:
Originally Posted by Randy Holmes-Farley
my refractometer measures the salinity in percentiles, from 0-28%.
Is it really percent (= %), or does it read o/oo, which is ppt. 
If it reads in percent, it is somewhat unlikely to be precise enough for reef tank use with the whole scale running from 0 to 28% salt.
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If he has the RHS28 from the link above then it is %, but if it is PPT that scale doesn't even go high enough.
And for the doubting of the 3.5%
This LINK from an article in the "Look Here for Answers" sticky in this forum says this:
Quote:
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Seawater is approximately 96.5% water and 3.5% salt, by weight. When the salinity of seawater is referred to as being 35 ppt (parts per thousand), that is the same as saying 3.5% salt.
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I was starting to doubt myself on the conversion. lol