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並前往https://ucanr.edu/sites/Salinity/Salinity_Management/Salinity_Basics/Salinity_measurement_and_unit_conversions

Salinity measurement and unit conversion - UC ANR

The most commonly used EC units are deciSiemens per metre (dS/m) and millimho per centimetre ... TDS (mg/L or ppm) = EC (dS/m) x 640 (EC from 0.1 to 5 dS/m).

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