Product name: swimming pool test strips Product shelf life: 2 years Product color: as shown in the picture 7in1 can test: 1. Total chlorine 2. Free chlorine 3. Bromine 4. ph5. Total alkalinity 6. Cyanuric acid 7. Total hardness 3in can test: 1.Total Chlorine2.PH3.Total Alkalinity product material:Paper Features 1. Pool Test Strips: These test strips are designed to provide a comprehensive test of your pool water, measuring pH, chlorine levels, and more. 2. pH Test Strips: Test strips can help you monitor the acidity or alkalinity of your pool water to ensure the best pH balance for comfortable and safe swimming. 3. Residual chlorine test: Using chlorine residual test paper, you can easily measure the free chlorine content in your pool water to ensure proper hygiene and sanitation. 4. Water Quality Monitoring: These test strips are essential for monitoring and maintaining pool water quality, helping you keep your pool water clear and safe. 5. Easy to use: The test paper is easy to use and can provide results of various water quality parameters quickly and accurately, making it convenient for regular maintenance of the pool. Precautions: 1. As we all know, different computers display colors differently, and the color of the actual product may be slightly different from the following pictures. 2. If you find it difficult to choose the size, you can contact us at any time. We will give you some suggestions, but they are for your reference only. Package includes: 50 pc swimming pool test strips