Aquarium Hydrometers and Refractometers
Aquarium hydrometers and refractometers measure the specific gravity (density) of water, which is determined by the amount of salt saturation. Refractometers are more expensive, but also more accurate, so they are a good investment for the committed saltwater aquarist. Keep your salinity constant by replacing evaporated water regularly. (Don't use saltwater for top-offs, only water changes - salt doesn't evaporate.)
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