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 sideways. Compare the test strip with the color scale on the packaging after 1 minute. Read 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) Additional 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 color scale and CO2 table. Contents: 50 test strips