Durable: Made of high quality plastic shell, strong and durable. The large screen displays the pH value and chlorine content of the test results for easy and accurate reading. Water Quality Analyzer: A handy tool that can be used to testing the pH and chlorine content of swimming pools and spas. You must prepare a 1.5 ppm chlorine solution in pool water for calibration. After the first successful calibration, you can quickly and easily test the chlorine and pH of the pool water. Professional Chlorine Tester: Using this useful tester, you can Quickly test if the chlorine and pH are within the ideal range for testing: chlorine 1.2 to 1.7 ppm and pH 7.2 to 7.8. If your test results are outside this range, it will provide you with useful information to adjust the chlorine and pH of the pool accordingly. It is definitely one of the best tools you need to maintain pool water. Designed for Swimming Pools: If you don't know if the chlorine content is 1 .5 ppm (or cannot find a calibration point), please use a traditional test strip. Designed for family-sized swimming pools or spas (excluding saltwater pools, industrial or scientific uses). After-sales Guarantee: We will provide you with lifetime technical support. If you have any questions about our products, please feel free to contact us and we will help you. Product Description Specification: Material: Plastic Weight: 298g/10.5oz Main body size: 190*120mm/7.5*4.7in Length of handle probe: 150mm/5.9in Probe length: 48mm/1.9in (excluding black belt) Cable length: 130mm /5.1 inch Power supply: 1 * 1.5V AA alkaline battery (NOT included) Package list: 1 * pH analyzer chlorine CL2 with probe Note: 1. You must prepare 1.5 PPM of chlorine solution in pool water for calibration 2. If you are unsure if the chlorine level is 1.5 PPM (or cannot find a calibration point), use a traditional test strip 3. Once the pool is calibrated, there is no need to recalibrate unless it is modified to use another pool water to measure another pool.