Tube test for the determination of Ammonium. Precise rapid tests for all kind of water and waste water samples. Time-saving and reliable analysis together with Macherey-Nagel NANOCOLOR photometers. Measuring range: Ammonium - 30–160 mg/L NH₄-N, Ammonium - 40–200 mg/L NH₄⁺Manufactured by Macherey-Nagel