Describe: The extremely easy-to-use swimming pool water quality test strip, the description is simple and clear, and reliable results can be obtained immediately. Just dip and compare with the color chart on the bottle, the ideal range is marked on the bottle 50 test strips means 50 tests-each pool test strip can provide fast and accurate results for any water source, including fresh and salty pools, spas and hot tubs Get safe, clean and clear water Our pool and spa test strips come with a great e-book that explains what your results mean and how to keep your water healthy and clean throughout the year Material: paper Size: 9.5*3.5*3.5CM Net weight: 0.04KG For maintaining healthy water chemistry in swimming pool or spa Analyzes four chemical factors; free chlorine, bromine,and pH Dip in water for instant reading; no-bleed pads give accurate color reading Comes in easy-to-store container Contains 50 strips per kit