TDS meter

TDS meter

A TDS Meter measures the amount of Total Dissolved Solids (TDS) in a solution. Since dissolved ionized solids like salts and minerals contribute to the electrical conductivity of a solution, a TDS meter often measures the conductivity of the solution which is then converted to a TDS reading.


A TDS meter typically report the weight ratio between the dissolved solids and the total weight of the solution. The unit used by most TDS meters is parts per million (ppm).

For example, a water sample of 1 kg containing 1 mg of dissolved solids is equal to 1 ppm TDS.

See also

*EC meter
*pH meter
*Total dissolved solids (TDS)

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