Description:This versatile aquarium test strip accurately monitors 7 important parameters: Hardness, Nitrate(NO3), Nitrite(NO2), Cl2, Total Alkalinity, Carbonate and PH.Nitrate: NO3 in concentrations greater than 50 mg/L is harmful to sensitive fish and additionally promotes algae growth. It will highly distress your fish and affect the growth of young fish.Nitrite: NO2 in concentrations greater than 1 mg/L and if present for extended periods is harmful to your fish and could over time lead to the loss of your fish.Chlorine: Chlorine may be present in tap water. It is harmful to fish, damaging their gills and skin, and must not be introduced to the aquarium.Total Hardness: GH Favorable hardness values are not too high or too low, between 25 to 150 mg/L.Total Alkalinity: 40-120 mg/L means OK.Carbonate: Ideal range of Carbonate is between 40-120 mg/L.pH: A pH value between 6.8 and 7.6 will be tolerated by most freshwater fish species. Ideal pH ranges are species-dependent.Features1. Keep the fish live in health and happy.2. Get accurate value of fresh salt water from your fish pond.3. Testing progress easily and quickly.Specifications:Product Name: 7 in 1 Aquarium Test StripsTest Time: 60 secondsQuantity: 100pcsStorage Condition: Please store in shadows away from direct sunlight.Package List:1 set 7 in 1 Aquarium Test StripsNote:1. Do not touch or contaminate the test block on the test strip;2. After each test strip is removed, tighten the bottle cap;3. Read in natural light;5, Do not use wet hands to take the test strips out of the bottle;6. The shelf life of unopened test strips bottles is 2 years;7. It is 3-6 months after disassembly, and the storage environment should not be damp and not exposed to the sun.