Package Content: Each pack contains 50 water test strips in 1 bottle, and there are 2 independent waterproof pouches. Each lot contains 25 pieces. The quantity is enough to meet your needs 3 in 1 P3 in 1 precision test paper for swimming pools: each test paper can be tested at the same time. Recommended range: total chlorine 0-1-3-5-10 ppm, pH 6.8-7.2-7.4-7.6-8.0-8.4, total taltality 0-40-80-120 -180-240 ppm, swimming pool precision test paper: each test paper can be tested at the same time. Recommended range: total chlorine 0-1-3-5-10 ppm, pH 6.8-7.2-7.4-7.6-8.0-8.4, total level 0-40-80-120 -180-240 ppm Easy to use: It is also very easy for beginners. Just take a test strip and soak it in the pool water for about 2 seconds, remove it and lay it flat and compare it after 15 seconds with the Health test color chart: it is recommended to test twice a week so that you can see if the pool water is in a healthy and clean condition. It is very useful and practical Wide application: These water quality test papers are suitable for swimming pools, spas, sewage and other liquids to prevent health problems and damage to the device Customer service: Dear friend, we guarantee the quality of the product. If you have any questions, please do not hesitate to contact us. We will solve them for you immediately. We hope you have a good spping. Technical characteristics: Quantity: 50 pieces per bottle. Dimensions: 3.5 x 9.7 cm. Test range: total chlorine - Test range: 0-1-3-5-10ppm. pH test range: 6.8-7.2-7.4-7.6-8.0-8.4. Test range for total calinity: 0-40-80-120-180-240 ppm. Characteristics: 1. Easy to test: chlorine / bromine, free pH, total alkalinity. 2. Easy to Distinguish: The color difference is obvious, and it is easy to compare the band color with the color chart. 3. Tests are done twice a week at both ends of the pool for the best results. 4. For instant reading, soak it in water and place it in an easy-to-store container. 5. Perfect for pool and spa testing. Instructions for use: Take a test strip and put it in the pool water for about 2 seconds. Take it out and lay it flat. Compare the value measured after 15 seconds with the color chart. Notes: Due to the lighting and screen difference, the items color may be slightly different from the pto.