KKmoon 6in1 Multi-parameter Water Testing Meter Digital LCD Multi-function Water Quality Monitor pH / RH / EC / CF / TDS(PPM) / TEMP Multiparameter Water Quality Tester (E1597US) Widely used to measure the pH / RH / Temperature / Conductivity EC / CF / TDS(PPM) of solution/water. Imported IC and high cost performance. Test temperature in  / (switchable unit). Easy calibration of pH and TDS with just a mini-screwdriver. Can work continuously more than 10 hours of power outage or outdoor without power after charging the battery for 3 hours. FCC certificated to offer safer and preciser measurement. Can online monitoring for a long time. Clear LCD with backlight, 3 results displayed simultaneously. Apply in water sources, aquarium, hydroponics, laboratory, spas, swimming pools and other water systems. Automatic temperature compensation. Easy to use and provides instant display of results.