Features:High-Quality Material: Made of high-quality material, wear-resistant and sturdy, not easy to break, and can be used for a long time.Precise Measurement: Can detect water pH and chlorine levels in swimming pools and spas.Easy to use: This water quality tester features a simple and intuitive interface with an easy-to-read digital display or color-coded indicator, making it suitable for professionals and beginners alike.Portable Design: The compact and lightweight design is easy to carry and ideal for testing water quality in a variety of environments including homes, laboratories, aquariums, and outdoor environments.MULTIPURPOSE FUNCTIONALITY: Versatile enough to test the quality of drinking water, aquarium water, hydroponic solutions, swimming pools, spas and more, providing comprehensive water quality analysis.Notice:1.Actual color may be slightly different from the image due to different light effect2.Please allow 1-3cm deviation due to manual measurementMaterial: Plastic + MetalSize: about 18*11.6*3.1cmPower Supply: 1*1.5V AA Batteries (not included)Recommended chlorine level for pools and spas: 1.2 ~ 1.7ppmRecommended pH level for pools and spas: 7.2 ~ 7.8pHAttention:Please don't immerse the probe in any liquid other than pool or spa water.Please rotate the switch to close position when not in use.Please store the tester in cool and dry place.Usage:Before you use this tester for the first time, you must adjust it to match your swimming pool or spa water with the following sequence:1. Test your pool or spa water using a conventional liquid test kit2. Record the chlorine reading level as you will need.3. No adjustment is required for pH.