Pool Water TestingThis tester is designed to test pH and chlorine level for swimming pools and spas. No other chemicals are needed. Read the instructions carefully, you will quickly master its use. Different test situations have different rules. Precise ReadingA large screen for quick and accurate display of pH and chlorine levels you can easily know the result. High quality The case is made of selected plasticDurable. The tester is compact, light and easy to carry. With a hole for convenient hanging. AttentionPlease do not immerse the probe in any liquid other than pool or spa water.Please turn the switch to the closed position when not in use.Please store the tester in a cool and dry. UsageBefore you use this tester for the first time, you should adjust it to your pool or spa water in the following sequence: 1.Test your pool or spa water with the using a conventional liquid test kit 2. Record the chlorine reading level as needed.3. No adjustment is required for pH.