Simple and professional checking with 6 very precise water tests Take a water sample, add right amount of test reagent, compare resulting colour on colour chart and read off values With: pH test for the acidity, KH for the stability, GH for the mineral content, ammonium test for the fish   s health, nitrite test for the toxic nitrogen and phosphate test for the algae nutrient content Comparator system for easy and precise reading and for taking the possible inherent water colouring into account Complete, incl. weather-proof case, colour charts, glass vials, syringe, dosing spoon, comparator block and test reagents