The JBL ProAqua Test pH 6.0 - 7.6 is designed for the accurate measurement and routine control of the pH-value in freshwater within the relevant range of 6.0 -7.6, and above all for the control and the adjustment of CO2-fertilization. The compensation method developed specially by JBL allows precise and reliable results to be obtained even in moderately discoloured aquarium water, e.g. caused by peat filters and disease treatment.JBL ProAqua Test pH 6.0 - 7.6+ for approx. 80 measurements in freshwater+ gradations in steps of 0.2 pH with glass cuvettes+ laboratory compensation system compensates water discoloration+ colour scale with 9 colours from light green to blue+ includes syringe to measure amount of test waterYou can oder the complete test kit with coloure chart and test accessories or only the reagents at the refill kit.