NYOS Magnesium Test Kits NYOS Magnesium Test Kit delivers laboratory-grade precision for measuring magnesium levels in marine aquariums. Its clear color change and easy titration process ensure accurate readings to maintain ideal Mg balance. Higher Level Testing: Highly sensitive reagents Professionally calibrated color chart Differentiated color gradations Precise sliding comparator Sample tubes made of glass Additional Features calibrated dropper made by a German manufacturer ensures uniform drops during all repeat tests reagents are made in Germany in accordance with EN ISO 9001 reagents are analyzed according to AAS and NIST standards strict batch and quality control easy to use with intuitive pictogram instructions Made in Germany Specifications Number of Tests: 50 Measurement Range: 1 – 160 mg/l NO3