【Material】 The pH meter consists of high quality plastic shell, durable and sturdy. And it has a large screen that displays the pH and chlorine level test result for easy and accurate reading. 【Description】 The pH value is one of the most important factors important to the pool water balance and should be tested and corrected at least weekly. The pH value is the measurement of the acidity/alkalinity of pool water. Chlorine, which kills bacteria, algae and microorganisms. It cannot be used in salt water. 【Note】 Too little chlorine leads to the growth of algae and bacteria, waterborne diseases, cloudy water and poor hygiene some water. Too much chlorine can cause irritation to the eyes, nose and skin. Also remember that chlorine in the swimming pool is carcinogenic and we must strive to keep its level at the minimum necessary for complete disinfection. 【Wide application】 The pH test for swimming pool is widely used for measure drinking water, aquariums, swimming pools, tap water, hydroponics, spas, laboratories and scientific testing. 【Applicable objects】 The swimming pool water tester is specially designed for family-sized pools or spas. ，The pH tester is the ideal small tool for home and laboratory pH testing applications. Please note that due to manual measurements and display differences, there may be have slight differences between individual products and photos.