Indicator strips - nitrates and nitrites (for semi-quantitative ion determination)

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High quality indicator strips by German manufacturer, chemical company Macherey-Nagel. From the Quantofix series. Ranges: 0-10-25-50-100-250-500 mg/L NO3- and 0-1-5-10-20-40-80 mg/L NO2. Includes 6x95 mm strips. Enough for 100 determinations.