1.Health begins with water quality, this portable water quality test pen is a handy assistant for your home water quality testing.Whether it's drinking water or bath water, you can check the quality of it with this test pen to better maintain your health. 2. With color screen display function, it can show the test results clearly and let you know at a glance. It also has a USB charging function, making it convenient for you to charge it anytime and anywhere. 3.This test pen integrates five test modes, including TDS, SALT, EC, PH and temperature, which can comprehensively test water quality and meet your needs in different aspects. Whether you want to test drinking water quality or swimming pool water quality, you can easily handle it. 4.Lightweight and easy-to-carry design allows you to carry this test pen anywhere and anytime to test water quality. Whether you are at home or outside, you can easily test the water quality to protect your health.