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It's a great little thing to throw in the sump just to keep an eye on the approximate SG.
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I don't recomend this for two reasons. First, it floats around in the sump and is prone to getting chipped or even shattering while floating around in the sump.
Second, stuff likes to grow on it, as soon as stuff starts growing on it, the hydrometer will quickly start reading wrong. While it is easy to clean, I think it is easier to leave in a plastic tube, and take out when you are ready to read the SG.