50Pcs 7in1 Water Quality Test Strips PH Nitrate Nitrate Chlorine Alkalinity Hardness for Swimming Pool Pond Aquarium Tap Fish TankOOTDTYDescription:7-in-1 Upgrade: Indicator Paper Can Be Used for Rapid Analysis and Detection of Nitrate, Nitrite, pH, Free Chlorine, Total Hardness, Total Alkalinity, Total ChlorinePractical Application: Wells and pipes or pools can be easily polluted. It is recommended to use this indicator paper frequently. Accurately measure the pH to show the alkaline state with a strip. Easy to use: Dip the indicator paper in the water for 2 seconds, hold it in the air for about 60 seconds, and then adjust the color on the back of the bottle to get the reading to test the pH at home conveniently. Economical and valid: the water quality should be tested weekly. One pack of our test strips contains 50 test strips. It is used to test water quality in drinking water, household faucets, well water, fresh water, aquariums, swimming pools and more. Portable Design: There are 50 test strips in each bottle. It is compact and easy to carry. Specifications:Bottle Material: Plastic Test Strip Material: Paper Color: As Shown in Picture Length: About 11mm/0.43in Quantity: 50 Strips in Each Bottle Packing List:50pcs/Bottle X PH Test Strips1 pcs X User ManualNotes:1. Due to the light and screen difference, the item's color may be slightly different from the pictures shown.2. Please allow 0.5-2cm tolerance due to manual measurement.