Bullet Points: 1、Upgrade 6 inches (about 6 cm) 1 liter: test PH, total chlorine, no chlorine, total alkalinity, acid purification, full hardness, etc., more powerful than 5 or 4 pool test panels and liquid test tools 2、17S test: There are 2 test strips for underwater soaking pools, keep about 15 in the air, and then match the color of the strip to the color on the back of the bottle, which takes about 17 seconds. Pool test strips are easy to use and even suitable for beginners. 3、Environmental protection: The water quality of the pool should be tested weekly. A pack of test strips includes 50 pool test strips and seals, 5 moisture-proof packages to ensure long-term storage. 4、Health: Test strips are used for swimming pool, spa, hot tub water testing, and you can ensure that the right amount of chemicals are kept in the pool to avoid health problems and damage. 5、Easy to carry: size about 3.9*1.6 inches Description: 3-in-1 /5-in-1 /6-in-1 swimming pool test paper Residual chlorine PH value Alkalinity Hardness test strip A bottle of 50 Features: 3-in-1 /5-in-1 /6-in-1 swimming pool and hot spring water test strips. Test free chlorine, bromine, pH, total alkalinity, total hardness and cyanuric acid. Test twice at the pool twice a week for best results. A good way to easily understand your water quality in the key. Specification: Type: swimming pool SPA test strip Test: TC, CL, PH, ALK, CYA, TH Quantity: 50 / bottle Test Range: Total chlorine test range: 0~10ppm Free chlorine test range: 0~10ppm PH test range: 6.8~8.4 Total alkalinity test range: 0~240ppm Total hardness test range: 0~1000 Cyanuric acid test range: 0~240 List: 1*bottle of pool SPA test strip (50 / bottle) Note: 1. The color of the item may be slightly different from the photo due to the difference in light and screen. 2. Please allow a difference of 0.5-2 cm due to manual measurement. For maintaining healthy water chemistry in swimming pool or spa Analyzes four chemical factors;free chlorine, bromine, pH, total alkalinity, total hardness and cyanuric acid Dip in water for instant reading; no-bleed pads give accurate color reading Comes in easy-to-store container Contains 50 strips per kit