8 IN 1 water quality tester: Professional measure pH, EC, TDS (ppm), ORP, CF, Salinity, S.G., Temp meter , The measurement units can be switched on the screen with one click. Wifi Tuya APP Connected: Accurate real-time Wifi data transmission and clear measured values make it easy for you to save, manage and share test data without worrying about data loss Data Logger: Data automatically stored and saved after 30 days. Data is received at all times; a set of data is transmitted in 15 seconds; data curve graphs is provided analysis. You can receive excel file in your phone or PC LCD Backlight Display: Multi-parameter display at the same time, LCD backlight display for clear reading, support night monitoring Wide Applications: Apply in water sources, aquarium, hydroponics, laboratory, spas, swimming pools, and other water systems.