A TDS Meter indicates the (TDS) of a , i.e. the concentration of dissolved solids in it. Since dissolved solids such as and increase the of a solution, a TDS meter measures the conductivity of the solution and estimates the TDS from that.
Dissolved organic solids such as sugar and microscopic solid particles such as colloids, do not significantly affect the conductivity of a solution so a TDS meter does not include them in its reading.
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