Test strips for 6 important water values ​​in 1 minute: Orientation quick test for aquarium, pond, well, spring and tap water Easy to use: move the test strip for 2-3 seconds in the water. Remove the test strip. Horizontal dripping of water. Comparison after one minute: test strip with color scale on packaging Determination of the following values: chlorine, acidity (pH), total hardness (GH), toxic nitrogen compound (NO2), algae cause (NO3) and pH stability (KH) of the water