The TDS meter is the abbreviation of "Total Dissolved Solids" in English, which refers to the total amount of dissolved solids. Total dissolved solids represent the sum of inorganic salts and organic matter dissolved in water. Its main components include calcium, magnesium, sodium, potassium ions, and carbonate ions, bicarbonate ions, chloride ions, sulfate ions, nitrate ions, etc. Therefore, the TDS meter is a total dissolved solids tester. The unit of the TDS meter is ppm (i.e., mg/L), and its value is defined as a certain proportion of the conductivity value, generally around 0.7. The reference temperature for automatic temperature compensation of the TDS meter is typically 25℃, and the temperature coefficient is generally 2%/℃. This instrument features temperature compensation, fast and accurate measurement, and simultaneously displays the liquid's real-time temperature.