Feature:1. Accurately measure the chlorine content to keep the chlorine content in the swimming pool or spa within a safe range.2. Quick pH measurement keeps the swimming pool or spa in a safe pH range.3. Flexible extension cord can extend the distance and is suitable for various environmental measurements.4. Double-needle detection can detect chlorine content and PH value in water more quickly and accurately.5. The large dial is clear and more convenient to read, convenient and practical, simple to operate and easy to use.Specification:Condition: 100% Brand NewItem Type: Water Quality TesterMaterial: ABSBattery / Capacity: 1 x 1.5V AA Battery (Not Included)Application: Swimming pool water quality testing instrumentProduct Size: Approx. 19 x 12 cm / 7.5 x 4.7 inWeight: Approx. 231g / 8.1ozInstructions:In order to extend the service life and make sure measurement accuracy, please note:1. When not in use, keep the switch in the OFF position (facing the PH). Keep it cool and dry and noise-proof.2. Do not immerse the probe in any other liquid, small pool or mineral water.3. Regularly check whether the battery is full. One requires one 1.5V AA battery (not included).Probe Cleaning:A. Using #600 sandpaper, gently wipe off the generated metal pin.B. Wash with not strong and wash in water, then wipe dry with paper towels.C. Wait 3-5 minutes to reduce static electricity.Chlorine Calibration-Commissioning: Before you use ET to test your swimming pool or SPA water for the first time, be sure to commission ET as follows:1. Use a conventional liquid testing tool.2. Record the value read by chlorine as it will be useful. (Eg 1.5PPM).3. No need to adjust PH value.Ho