A TDS meter is a device used to measure the total dissolved solids (TDS) in water. TDS refers to the combined content of all inorganic and organic substances present in water, which can affect its quality and taste. The meter provides a numerical value, usually in parts per million (ppm), indicating the concentration of these solids. TDS meters are commonly used in various settings, including aquariums, hydroponics, and drinking water testing. They help users determine if water is safe for consumption or suitable for specific applications. Regular monitoring can ensure optimal conditions for plants, fish, and overall water quality.