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Salt Meters: Refractometers Measure Salt Levels
Veterinary & Aquatic Services Department, Drs. Foster & Smith
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Q. What is a refractometer and how do I use it?
 
A. Refractometers are an incredibly accurate way to measure salt levels, even at very low levels. Not only can refractometers be used for saltwater aquariums, but also for African Cichlid and Goldfish aquariums that use much lower levels of salt. They compensate for temperature AND are very easy to use. Just lift the plastic lid from the angular end, place a drop of water from the aquarium on the surface, and close the lid. Look through the viewing lens (round end) as if you are looking through a telescope. The line where the blue and white areas meet is your salinity (concentration of salt in water) or specific gravity, depending on which scale you use.
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