Parts List: 100 x 7 in 1 Aquarium Test Paper OR 100 x 6 in 1 Aquarium Test Paper Detailed description: Product Name: Aquarium Test Papers 7 in 1 / Aquarium Test Paper 6 in 1 Material: Test paper Size: 90 x 5 mm Optional Styles: 6 in 1 AquariumTest Strips,7 in 1 AquariumTest Strips Function:  Test nitrate, nitrite, general hardness, free chlorine, pH, carbonate and total alkalinity of the fish tank to test whether your fish tank is healthy water. Applicable Space: Tropical fish tank, shrimp tank, freshwater fish, goldfish, pond, aquarium, etc. Instructions: 1. Immerse the test area of the test paper in water for 2 seconds. 2. Take out the test paper and place it horizontally for 60 seconds. 3. Compare the test paper with the colorimetric table of the bottle body, and complete the reading within 30 seconds to obtain accurate results. Matters needing attention: 1. Please cover the bottle immediately after taking out the test paper. 2. Don't put your wet fingers deep into the bottle. 3. Do not touch or stain the test area of the test paper. 4. Store in cool, dry and dark conditions. 5. Please use it up within the validity period. Note: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 2. Please allow slight dimension difference due to different manual measurement. Thank you for your understanding. 7 in 1Aquarium Water Test Kit Our fish tank test strip can effectively test 7 elements, including total hardness, nitrate, nitrite, free chlorine, carbonate, pH value, and total alkali; Also, we can offer 6 in 1 aquarium test strips which can effectively test 6 elements, including total hardness, nitrate, nitrite, free chlorine, carbonate and pH value. Letting you quickly and easily test your fish tank if it is healthy water. Fast Testing and Easily Read put the pond test strips into the water for 2 seconds and remove them, then hold the strip horizontally for 60 seconds, and compare it with the color chart on the bottle to get an accurate value of the fish tank. You can get accurate results within 30 seconds. Accurate and Professional Testing Our aquarium tester papers come with a detailed color chart, detect low levels of impurities and foreign substances, help prevent any invisible water problems and keep your fish safe. It is a good helper for testing your aquarium, fish tank or pond as testing strips that can offer accurate values of water quickly, safely and easily. Widely Use Fish tank test paper is widely used in tropical fish tanks, Betta tanks, shrimp tanks, freshwater fish, goldfish, ponds, aquariums, etc. Easy to Carry One bottle contains 100 test strips, which is enough to test the water of 100 aquariums, and the rotating seal cover of the bottle has good sealing performance and is easy to carry and can be measured anywhere.