Material: The pH meter features a high-quality plastic shell that is durable and sturdy. It includes a large screen that displays pH and chlorine test results for easy and accurate reading. Description: pH value is one of the most important factors in maintaining proper pool water balance and should be tested and adjusted at least weekly. The pH level measures the acidity or alkalinity of pool water. Chlorine helps eliminate bacteria, algae, and microorganisms in pool water. This device is not intended for use in saltwater pools. Note: Insufficient chlorine can lead to algae growth, bacterial contamination, cloudy water, and poor sanitation. Excessive chlorine may cause irritation to the eyes, nose, and skin. Always maintain chlorine levels at the minimum required for effective disinfection. Wide Application: This pH test meter is widely used for testing drinking water, aquariums, swimming pools, tap water, hydroponics, spas, laboratories, and scientific applications. Applicable Objects: The swimming pool water tester is designed for residential-sized pools and spas. It is an ideal tool for home and laboratory pH and chlorine testing.