No_Floaters
Aquarium Advice Activist
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
http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=11275&ref=2020&subref=AC