TDS Meter (Total Dissolved Solids) and EC Meter

A TDS Meter indicates the Total Dissolved Solids (TDS) of a solution. This is the concentration of dissolved solids in it. Dissolved ionized solids such as salts and minerals increase the conductivity of a solution, a TDS (Total Dissolved Solids) meter measures the conductivity of the solution and estimates the TDS from that. Dissolved organic solids such as microscopic solid particles like colloids and sugar, do not significantly affect the conductivity of a solution so a TDS meter does not include them in its reading. A TDS (Total Dissolved Solids) meter typically displays the TDS in parts per million (ppm). For example, a TDS reading of 1 ppm would indicate there is 1 milligram of dissolved solids in each kilogram of water.

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EC Meter (Electrical conductivity meter)

An electrical conductivity meter (EC meter) is used to see what the electrical conductivity is of a solution. These meters are most commonly used in hydroponics, freshwater systems and aquaculture  to monitor the salt, amount of nutrients, or impurities in the water.