1. This box of three-in-one swimming pool water quality test strips contains a variety of test items, including PH value, swimming pool speed, residual chlorine, pH value, total alkalinity and total hardness, which can comprehensively test swimming pool water quality and ensure clean and healthy water quality. 2. The operation is simple and convenient. Just immerse the test paper in the swimming pool water, wait for a while and compare it with the color mark. You can judge the water quality through the color change and quickly and accurately understand the various indicators of the swimming pool water. 3. The design of this three-in-one test paper makes water quality testing more efficient. It can complete the testing of multiple indicators at one time, saving you time and energy, and making it easier for you to maintain swimming pool water quality. 4. High-quality test paper materials ensure the accuracy and reliability of test results, ensuring that you can discover and solve swimming pool water quality problems in time, keep the water quality clear and transparent, and provide a healthy swimming environment. 6. This box of three-in-one swimming pool water quality test strips is suitable for all types of swimming pools, including family swimming pools, public swimming pools, etc. It is an essential tool for you to maintain swimming pool water quality, allowing you to easily enjoy a refreshing and comfortable swimming experience.