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 reading, usually in parts per million (ppm), indicating the concentration of these solids. TDS meters are commonly used in various settings, including aquariums, drinking water testing, and hydroponics. By monitoring TDS levels, users can ensure that water quality meets specific standards for health and environmental purposes. Regular testing helps maintain optimal conditions for plants, fish, and human consumption.