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What is TDS? Total Dissolved Solids (TDS) is the total weight of all solids (minerals, salts, or metals) that are dissolved in a given volume of water, expressed in milligrams per liter (mg
L), or in parts per million (PPM). The higher TDS level in the water, the more the probability of harmful contaminants that can pose health risks or hinder the absorption of water molecules on the cellular level. Where you can apply to? TDS meter is great for all home and laboratory water testing applications. It can be widely used in water treatment industry, drinking water industry and household. Someone even will take the portable pen while they are traveling.