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This is used to measure the Total Dissoved Solids (TDS) in a given volume of water, usually expressed in mg per unit volume of water (mg/L), or parts per million (ppm). Total Dissolved Solids include ions, minerals, metals and salts in water. 

A TDS level exceeding 1000mg/L indicates water that is not pure enough for human consumption, and may be a sign that filters and membranes are not effectively removing bacteria and harmful particles from the water.

The TDS meter comes with 2 x 1.5V alkaline batteries.

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