72 inches (120 mm)

99 ppm (mg/L) (NH3-N)

Reliable Results – Professional-grade sensor delivers stable readings in seconds

weekend travelers

Be up in running in no time

Hanna Marine Magnesium Checker HC - HI783 Water Quality 72 inches (120 mm)The first Magnesium test of its kind for saltwater aquariums, our Marine Magnesium Checker HC (HI783) is just what every reef tank owner needs. Struggling with test kits is now a thing of the past. Stop guessing or interpreting a color change by eye. Get a fast, accurate digital read out every time. Perfect for testing and measuring Magnesium levels in saltwater aquariums, reef tanks, and other marine and aquaculture applications. Easy to read,