Post date: Nov 28, 2010 5:26:43 AM

Total Dissolved Solids Digital meter.

A TDS Meter indicates the amount of Total Dissolved Solids (TDS) in a solution. Since dissolved ionized solids like salts and minerals contribute to the conductivity of a solution, a TDS meter measures the conductivity of the solution then converts that figure to an estimated TDS reading.

A TDS meter typically displays the total weight of dissolved solids as a proportion of 1 litre of water. The unit used by most TDS meters is parts per million (ppm). For example, a TDS reading of 1 ppm would indicate there is 1 milligram of dissolved inorganic solids in each 1 litre of water.

Dissolved organic solids such as sugar, and microscopic solid particles such as colloids, do not significantly effect the conductivity of a solution so they are not measurable by a TDS meter.

Water classification

Water can be classified by the amount of TDS per liter:

  • fresh water < 1500 mg/L TDS
  • brackish water 1500 to 5000 mg/L TDS
  • saline water > 5000 mg/L TDS

Product Offered : TDS - 3

TDS specs