1.Easy to read data: the residual chlorine tester is an indispensable tool for fast and accurate pH and amp readings. Chlorine is the most commonly used water disinfectant that kills algae and microorganisms. Shuju data is also very easy to read. 2.KEEP YOUR POOL ON TRACK Water quality testers are essential tools to keep your pool or spa within chlorine and pH ranges without any further chemicals or guesses. We help you create an environment with y water quality. 3.Monitoring data: the water quality monitor is an electronic tester for testing the pH and chlorine content (Cl2) in the water and can routinely monitor the pH and chlorine content in swimming pools, spas and various water sources. 4.Versatile – The PH CL2 tester is ideal for home or laboratory use. It can be used for testing swimming pools, aquariums, spas, etc. or anywhere you need to test the pH value and get accurate data. Very wide range of application scenarios. It is a practical product.