Made of high quality plastic shell, large screen, durable and practical Just for measuring pool water pH No traditional chemicals just need Ideal for home and laboratory pH testing applications such as domestic drinking water, aquariums, swimming pools, tap water, hydroponics, spa, laboratory and scientific testing As a high precision measuring device, it can indicate the test result quickly Just for measuring pool water pH No traditional chemicals just need Ideal for home and laboratory pH testing applications such as domestic drinking water, aquariums, swimming pools, tap water, hydroponics, spa, laboratory and scientific testing A high precision measuring device, it can indicate the test result quickly and accurately A practical tool for testing water pH and chlorine level for swimming pool and spa, guarantee your health