UsageThe Ph Meter Is Used To Test The Tds Value Of Water And The Conductivity Of Water To Judge The Purity, And Also Has The Function Of Testing Water Temperature And Ambient TemperatureWide UseThe Ph Pen Can Be Widely Used In Water Treatment Industry, Drinking Water Industry, Family, Personal Home Travel, Field Work, Etc. As A Tool For Testing Drinking Water Quality DesignPlatinum Electrode Design Uses High-Purity Platinum Sensor Design To Ensure Accurate And Stable Measurement Values Over The Full Range Automatic Calibration FunctionThe Water Tester Has One-Point Automatic Calibration Function, The Instrument Allows Custom Calibration Fluid To Be Used During Calibration, Need To Enter A Known Conductivity Value In The Instrument And Immerse The Sensor In The Calibration Liquid, Then Press The Switch Auto-Lock Simple Measurement Value Lock Function, In Conductivity Measurement Mode, Press The Hold Key, The Instrument Automatically Locks The Current Measurement Value, Press Again, The Instrument Returns To The Measurement Mode