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FAQ #28458
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What is a Hydrometer?
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A hydrometer is a floating tube or dial that measures the Specific Gravity (density) of a liquid. Pure water has a specific gravity of one. Solutions with a specific gravity greater than one are denser than pure water. Ocean water has a specific gravity of about 1.022 and is denser than pure water. The specific gravity reading can be converted to a salinity reading if the water temperature is known.
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