Test strips for testing 7 important water values in 1 minute: quick test for general guidance when testing aquarium, pond, well and tap water Easy to use: Move the test strip in the water for 2 3 seconds. Remove the test strip. Let the water drain off sideways. Compare the test strip with the colour scale on the packaging after 1 minute. Read off the CO2 value in the table Determines the following water values: chlorine, acidity pH, general hardness GH, toxic nitrite compound NO2, cause of algae NO3, pH stability KH and main plant nutrient CO2 content using the table Further tests for phosphate or ammonium/ammonia etc. are available as individual tests in the JBL program Package contents: test strips EasyTest 7 in 1 on colour scale and CO2 table. Contents: 50 test strips