So I have this coralife hydrometer. Its seems to be all over the place. What is the best way to know what your specific gravity is? What do most people use?
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Actually not true. They measure different things, one light transmission, the other relative weights. There is correlation between the 2 of course. You can no measure specific gravity which has no units with a refractometer which has results reported asGet a refractometer much more actuate