3 in 1: Swimming pool precision test strip, each test strip can be tested at the same time. Total Chlorine, test range 0-1-3-5-10, PH test range 6.8-7.2-7.4-7.6-8.0-8.4, Total Alkalinity, The test range is 0-40-80-120-180-240. Quick and accurate: The ideal water quality is based on an accurate water quality test. Take a test paper and immerse it in the swimming pool water for about 2 seconds, take it out and place it flat, and compare the reading with the color chart after 15 seconds. Moisture-proof packaging: Each bottle is packed in 5 small aluminum foil bags, 10 pieces in each aluminum foil bag, 50 test papers per bottle, two bottles in the package, a total of 100 test papers. Healthy water quality: Ideal water quality makes life healthier and safer. Ensuring it is within the recommended range will help maintain the balance of the swimming pool and hot spring water. It is also suitable for drinking water, aquariums, industrial water, ponds, and hot spring aquatic products. Perfect choice: Test on both ends of the pool twice a week to get the best results, perfect swimming pool, and spa water quality test paper. Ame: 2pcs pool PH test paper Size: 9.5 x 7 x 3.5cm Free chlorine test range: 0~10ppm PH test range: 6.8~8.4 Total alkalinity test range: 0~240ppm