Total dissolved solids refers to the total concentration of substances – including inorganic salts and organic matter – dissolved in a given volume of water, which is expressed in units of mg per litre or parts per million.
Common inorganic salts that are found in water are cations like calcium, magnesium, potassium, and sodium, as well as anions like carbonates, nitrates, bicarbonates, chlorides and sulphates. Cations are positively charged ions, whereas anions are negatively charged ions.
If you’re looking to discover an easy way to test for total dissolved solids, our TDS meter is an efficient and reliable solution.
The output for the TDS sensor is in parts per million (PPM) or mg/L.
A TDS value gives a measurement of the amount of organic and inorganic substances dissolved within the water.
Our total dissolved solids sensors come as standard on many of our probes — below are some examples. To see all of the probes that feature TDS sensor, please visit the Products section.
The TDS sensor is included on every Aquaprobe and Aquasonde, it is also included in the AquaPlus optical dissolved oxygen sensor.