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TDS meter is the abbreviation of 'Total Dissolved Solid', which refers to the total amount of soluble solids. Soluble solids include inorganic salts and organic substances dissolved in water. Its main components include calcium, magnesium, sodium, potassium ions, as well as carbonate ions, bicarbonate ions, chloride ions, sulfate ions, and nitrate ions. Therefore, a TDS meter is a device for measuring the total amount of soluble solids. The unit of TDS meter is ppm (i.e., mg/L), and the value is defined as a certain percentage of conductivity, typically around 0.7. The TDS meter has automatic temperature compensation with a reference temperature of 25°C, and the temperature coefficient is generally 2%/℃.

The KL-139ATDS is waterproof, with a waterproof rating of IP55

KL-139BTDS, either walled or embedded, to facilitate installation, operation, and maintenance.

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