Usage Tips:5 in 1 Water Quality Tester: The pH meter is designed with 5 in 1 function, which can measure PH, TDS, EC, salinity and temperature simultaneously with great precision.Omni-directional water quality measurement to ensure water quality health.Precise Measurement: In order to achieve high accuracy, it is equipped with titanium alloy probe and reliable Automatic Temperature Compensation (ATC), which can ensure accurate reading at different temperatures. When the measured value is stable, long press the HOLD/TEMP button to lock the measured value, and pull it out to view, which is really easy.Auto-off function and large display: The PH tester has a backlit LCD display that allows you to see the measurement clearly in any case. Auto-shutoff feature turns device off after 5 minutes of inactivity to save Energy. Uses a fully transparent liquid crystal (LCD) to display 4-digit values and their corresponding physical units of measurement.IP67 Waterproof Rating: IP67 is an international waterproof and dustproof certification. Protection against dust intrusion, short-term immersion.Wide range of uses: This water quality detector is ideal for testing water, swimming pools, aquariums, spas, hydroponics, laboratory and drinking water, etc.