1、Waterproof Shell: The test pen is a dust proof and splash proof structure made of ABS, which meets the IP65 waterproof level and is safe to use. 2、Portable Size: This water quality tester is made into the shape of a pen, which is small and convenient, and can be carried around in a bag and measured at any time. 3、LCD Screen: The test pen has a large LCD screen, which can accurately and clearly display the water quality and temperature. 4、3 in 1 Test Pen: This water quality test pen can test the pH, TDS and temperature of water to ensure your drinking water safety. 5、Sensitive Response: The sensor on the bottom of the test pen is very sensitive, the test results are accurate, and it is easy to use. Item Type: Digital Water Quality Pen Material: ABS Battery Type: 3 x button battery 1 x Digital Water Quality Pen