5 in 1 Multifunction TesterPH/EC/TDS/Salinity/Thermometer Digital Multi-Function Tester. All-round measurement of water quality to ensure healthy water quality. Automatic Temperature CompensationTemperature can affect reading levels, our water meterrs automatic temperature compensation can ensure that youre getting the best possible reading. 3 Point CalibrationBuilt-in 3 calibration points (1413uS/cm 12.88ms/cm 111.8ms/cm) PH:1 point (6.86) or 2 point (6.86 4.00) (6.86 9.18) or 3 point (6.86 4.00 9.18) can automatically identify the calibration solution. Quick and AccurateThe built-in sensitive electrode sensor allows you to test your liquids quickly and accurately. 5 Minutes no operation, the meter will automatically shut down. Wide Range of ApplicationsThe lightweight and portable size allows you to easily carry it with you, and measure it anytime, anywhere. Widely used in aquarium, glass fishpond, pharmaceutical research, agriculture, laboratory, water environment, quality control and other fields.