I found the article I was looking for which discusses salinity and how to measure it by Randy Holmes Farley...  http://reefkeeping.com/issues/2004-06/rhf/index.php .  I only include it because your salinity seems so low that I question if it is an accurate reading.  The begining discusses salinity and the end the different ways to measure it.  
		
	
		
		
		
		
			
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