JBL ProAquaTest Easy 7in1 Test Strips for Rapid Aquarium Water Analysis • Test strips for measuring 7 critical water parameters in 1 minute: quick test for aquariums and ponds, as well as tap water and well water • Easy to use: immerse the strip for 2-3 seconds in the water, remove the strip, let the water drain, compare with the color scale on the package after 1 minute. Determine the CO2 content in the table. • To determine the following parameters: chlorine, acidity (pH), general hardness (GH), toxic nitrites (NO2), phosphates - the cause of algae (NO3), pH stability (KH) and the main nutrient for plants (CO2 according to the table) • JBL tests for phosphates, ammonium/ammonia, etc. can be purchased separately • Included: test strips - 50 pcs.