Size: 9.3*3.5cm Material: paper Quantity: 50pcs/bottle Uses: Suitable for water quality testing in swimming pools or hot springs, and can detect available chlorine, pH value, total hardness, etc.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.1 bottle of test pape