TDS indicator (best indicator for CMD demo)

A TDS (Total Dissolved Solids) indicator is a device that measures the concentration of dissolved solids in a solution. TDS is typically expressed in parts per million (ppm) and refers to the total concentration of all inorganic and organic substances that are present in a solution in a dissolved form.

In general, TDS indicators work by measuring the electrical conductivity of a solution. When solids are dissolved in a solution, they ionize and create ions that are free to move and carry an electrical charge. This electrical conductivity can be measured using a TDS indicator.

TDS indicators typically use two electrodes that are placed in the solution being measured. An electrical current is passed between the two electrodes, and the resistance of the solution is measured. The higher the concentration of dissolved solids in the solution, the higher the electrical conductivity and the lower the resistance.

TDS indicators are commonly used in a variety of applications, including water treatment, aquariums, and hydroponics. In water treatment, TDS indicators are used to monitor the effectiveness of water filtration and purification systems, as well as to ensure that the water meets certain quality standards. In aquariums and hydroponics, TDS indicators are used to monitor the nutrient levels in the water, which is critical for maintaining the health of fish and plants.