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Electrical Conductivity (EC) is defined by the ability of a solution to conduct an electrical current.
Total Dissolved Solids (TDS) is defined as the amount of solids dissolved in a solution.
Two electrodes with an applied AC voltage are placed in the solution. This creates a current dependent upon the conductive nature of the solution. The meter reads this current and displays in either conductivity (EC) or ppm (TDS).
By means of a conductivity meter. The conductivity is measured and the TDS is calculated by a fixed mathematical formula in the meter.
Both are units of conductivity. 1000 microSiemens (µS) = 1 milliSiemen (mS).
Multiply by 1.4; ex: 500 x 1.4 = 700.
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