in 1 Water Quality Test StripsThe Aqua Della Multi Test 6 in 1 is a tube containing no less than 50 test strips. With each strip, the 6 essential values of water are measured: nitrate, nitrite, total hardness, carbonate hardness, acidity and chlorine. The strips are easy to use and in 60 seconds you can compare values using the color scheme on the tube. The test strips can only be used for freshwater aquariums or ponds. Features:1 tube with 50 test stripsEach strip measures 6 essential values of water.Nitrate, nitrite, total hardness, carbonate hardness, acidity and chlorineResult in 60 secondsOnly suitable for fresh water (aquarium/pond)