Specification: Name: 2pcs swimming pool PH test paper Size: 9.5*7*3.5cm Test Range: Free chlorine test range: 0~10ppm pH test range: 6.8~8.4 Total alkalinity test range: 0~240ppm Quantity: 50 pcs/bottle Feature: -3 in 1 swimming pool and hot spring water quality test strip. -Easy to test: free chlorine/bromine, pH, total alkalinity. -Easy to distinguish: The color difference is obvious, and it is easy to compare the strip color with the color table. -Test twice a week at both ends of the pool for best results. -Immerse in water for immediate reading and put in a container that is easy to store. -Perfect swimming pool and spa test. Package Including: 2* swimming pool PH test paper Upgrade 3 in 1::Used to test free chlorine/bromine, pH, total alkalinity, with anti-VC interference ability, fast and accurate test. Easy and accurate:: Just immerse a piece of test paper in water for about 2 seconds, take it out and lay it flat for about 15 seconds, and then check the result with the color card on the bottle. Health Test:: It is recommended to test at both ends of the pool twice a week to obtain the best results, so that you can know whether the pool water is in a healthy and clean state. Widely used::Suitable for drinking water, aquariums, swimming pools, spas, etc. It can also be used to test the water in the hot tub and it will work normally. Easy to store::The test paper is packed in a container that is easy to store to ensure long-term storage. Perfect swimming pool and spa test.