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The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
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Follow this link for a $35 refractomter from Foster & Smith. I usually don't do this..but you can't beat the price! Everyone who needs to know the salinity of their water needs one.
http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=11275&ref=2020&subref=AC