Feature: 1. 1. Easy to use: Just immerse the test strip in water for 5 seconds, take it out and wait for 1 second, compare the color change of each panel with the color chart on the side of the bottle to get the result. 2. 2. Take free chlorine, pH and total alkalinity tests: so you can enjoy swimming without stress. 3. 3. Easy and fast to use: Accurate PH test paper can be used for water quality testing in swimming pools and hot springs to protect your health. 4. 4. Keep the water quality healthy and clean: Use these test strips to help your swimming pool, hot spring maintain proper water chemistry, and always keep the pool water in a healthy and clean state. 5. 5.7-in-1 Complete Chemical Test: Tests for total chlorine or bromine, free chlorine, total alkalinity, pH, total hardness and cyanuric acid. Specification: Size: 9.3*3.5cmMaterial: paperQuantity: 50pcs/bottleUses: Suitable for water quality testing in swimming pools or hot springs, and can detect available chlorine, pH value, total hardness, etc. Package List: 1 bottle of test pape