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A refractometer does indeed measure the salinity level and is much easier and more accurate than a hydrometer.
I apologize if this comes out blunt, have you researched setting up a SW tank? Read the articles and stickies, there's a ton of good info in there to get you started.
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8G Peacock Gudgeon, 75G CA/SA cichlids, 120G Planted, 50G Mixed Reef ( Build). 125G Reef and 100G frag tank in process.
Save the reefs... Buy captive raised when possible!
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