<p><span style="color: #0000ff; font-size: 12pt;"><strong>A TDS meter indicates the total dissolved solids (TDS) of a solution, i.e. the concentration of dissolved solid particles. Dissolved ionized solids, such as salts and minerals, increase the electrical conductivity (EC) of a solution. Because it is a volume measure of ionized solids, EC can be used to estimate TDS. Now You can online purchase various types of TDS Meter<span style="color: #ff0000;"> With Free Calibration Certificate.</span></strong></span></a></p>