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TDS & Conductivity Meters

Conductivity is a measurement of how well an aqueous solution can carry an electrical current. It is commonly used to determine the levels of impurities in the water, typically the more impurities in the water, the higher the conductivity value will be.

Absolutely pure water has a conductivity value around 0.055μS/cm, tap water typically has a value around 50-100μS/cm and sea water normally has a value around 53mS/cm.

To take a conductivity measurement, two plates are placed into the sample, a potential is applied across the plates, and the current is measured.

For most salts, there is a linear relationship between ion concentration and the conductivity value, although in some cases, such as sulphuric acid, it stops being linear when at very high concentrations.

TDS, short for Total Dissolved Solids, is an estimate of the mass of dissolved solids within the solution and is typically expressed as mg/L or parts per million (ppm). It is derived from the conductivity reading using a conversion factor.

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