Simple and safe control of water parameters in aquariums or ponds. Determination of the optimal pH in freshwater and seawater.Comparative lab system to compensate for the clean coloring of the water: fill the test tube with water to be tested, add reagent in a test tube, position in the block, read the values on the color chart.Use: When using water for the first time: once a day for the first week, then once a week.Detailed information on water analysis and troubleshooting can be found at JBL/Topics/Aquarium or Pond.Included in delivery: 1 pH 7.4-9.0 Quick Test. Contents for approx. 80 measurements, reagent, 2 glass test tubes with screw cap, syringe, comparator and colour chart. Reagent refills available separately.