pH Meter is an instrument that measures the hydrogen-ion activity in water based solutions indicating its acidity or alkalinity expressed as pH.
The device measures the difference in electric potential between a pH electrode and a reference electrode. This difference in potential relates to acidity or pH of the solution.
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A TDS meter is used to indicate the total disssolved solids (TDS) of the solution i.e. the concentration of dissolved solid particles.
Dissolved ionized solids such as salts & minerals increase the electrical conductivity (EC) of the solution can be used to measure the TDS.