Aquadene 6 in 1 Test Strips

6 in 1 Test Strip. Instructions: 1.Immerse the strip for 2 seconds and then remove the strip. 2.Do NOT shake excess water off and compare against the color chart. 3.For GH, Cl2, KH, pH, wait 15 seconds to read results, for NO2 and NO3, wait 60 seconds to read results.