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Salifert Dissolved Oxygen Test Kit Niban An Elf's Story is theBrand: Salifert Features: Corals and marine fish require very high levels of oxygen concentration because of the low solubility of oxygen in salt water so it is very important to regularly test the level of oxygen present The Salifert Oxygen Profit Test is extremely fast, measuring oxygen levels in just a few minutes and is scaled from 2 14 mg L Sufficient for up 40 tests Can be used for marine, fresh and garden pond water Made in Holland model