• To obtain an approximate sodium chloride TDS value, multiply the EC reading (in milliSiemens/cm) by 1000 and divide by 2.

    To get an EC value, multiply the ppm reading by 2 and divide by 1000.

    Thus, if your EC is 1:
    1 * 1000/2= 500 ppm.

    And if your ppm is 500:
    500 * 2/1000= 1 EC

    TDS, EC, PPM, etc

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