JBL ProAquaTest pH 6.0-7.6Simple and safe control of aquarium water parameters. Determination of the optimal pH for freshwater aquariums. Comparative lab system to compensate for clean water coloring: fill plastic test tube with water to be tested, add reagent to one test tube, place both test tubes in the block, read the values on the color chart. Use: for a new filling: once a day for the first week, then once a week. Online laboratory: regular control for a healthy aquarium with living conditions close to the natural environment. Included in delivery: 1 pH quick test 6.0-7.6. Contents for approx. 80 measurements, reagent, 2 glass test tubes with screw cap, syringe, comparator and color chart.