- Fast and accurate multi-parameter testing: provides fast, accurate and reliable results for seven water quality parameters in one test strip—pH, chlorine, nitrate, nitrite, carbonate, hardness and total alkalinity. - Wide applicability: constructed with high-quality materials and high sensitivity for clear, easy-to-read results. suitable for fresh and saltwater aquariums, planted tanks, aquariums, ponds, pools, swimming pools, aquaculture and other water systems to easily monitor water quality and health. - Easy to use: dip the test strip into the water sample, wait about 2 seconds, lay it flat, wait about 30 seconds, then compare the strip colors to the bottle color chart and markings to obtain the result. aquarium test paper accuracy is up to 99%. - Storage and handling: store in a dry, light-protected place using sealed and light-proof packaging; tighten the bottle cap immediately after each use. storage conditions: 2C to 30C, dry and light-protected; (storage at 2C to 8C is recommended).