Measurement Range - The meter can get results quickly and accurately without using messy color charts or test strips. It has a resolution of 0.01, an accuracy of 0.05, a chlorine content in the safety measurement range: 1.2-1.7 ppm. pH value within the safe measurement range: 7.2-7.8. Water Quality Tester- For testing pH and chlorine levels for swimming pools and spas. When measuring the chlorine value, you should match the standard solution with a CL value of 1.5 ppm. Miniature design - Lightweight and easy to carry, since the pH meter has built-in automatic temperature compensation (ATC), it no longer needs to support the temperature of the test liquid, so it can accurately determine the pH of the sample at any temperature in the range of 0C to 80C (32F to 176F), very practical. Standard - Recommended chlorine level for pool and spa: 2 to 1.7 ppm and 7, 2 to 7.8 ph for PH level for swimming pool and spa. Application - It is used to regularly monitor the pH and chlorine content of swimming pools, spas and different water sources .