Conductivity of a liquid is a measure of charged particles, called ions, that are free to move around. The conductivity itself is carried by the ions and the more ions there are in a solution the higher its the conductivity. A PH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH. TDS meter is a small hand held device used to indicate the total dissolved solids in a solution, usually water.
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