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minireef isnt talking about a swing arm hydrometer, the tropic marin drop in hydrometer is good, you do need a large graduated cylinder, glass, or bucket to use it though as you cant read it in the tank with water flowGet a refractometer or the Hanna salinity checker, a hydrometer, no matter the manufacturer, just isn’t as accurate. For a fish only aquarium, a hydrometer is okay, but for a reef tank you really need something more precise (and a good refractometer is only maybe $10 more than a good hydrometer). If you do get a refractometer or the Hanna checker, make sure to get calibration fluid as well.