The AQUA-TEST 7 IN 1 provides quick and accurate results with a single strip. It guarantees the detection of pH, KH, Cl2, GH, NO2, NO3, CO2 parameters in freshwater or marine aquariums or ponds. The package contains 50 strips and its use is simple: dip the strip into the water for a few seconds, remove it, place it on the color chart outside the packaging, and wait one minute.