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The Magnesium Checker® HC for sea water is a hand colorimeter that determines the magnesium concentration of colorimetric. The magnesium checker was specially developed for measurement in a seawater aquarium and uses the beer-lambert principle for the colorimetric determination of the magnesium concentration. The range of 1000 to 1800 ppm magnesium is suitable for reef aquariums that are filled with fish or fish and corals. Magnesium is the third most common ion in sea water, only exceeded by sodium and chloride. Its frequency is crucial for the formation of weak ion pairs with carbonations. This enables the availability of calcium and carbonate for recording by corals and invertebrates. Low magnesium levels lead to low or unstable calcium and alkalinity levels. Signs of low magnesium lev.