Unfortunately, tap water is far from drinking water quality. Many people choose to purchase water purification systems to address this issue, but not all systems have displays and sensors to monitor water quality. In such cases, specialized measuring devices come to the rescue, one of which is a TDS meter. In addition to routine water monitoring, TDS values can be important for issues such as watering and repotting flowers, changing aquarium water, and pool water quality. This device is a great help, as it helps accurately determine when your filter needs servicing. A TDS meter measures the amount of dissolved solids in water. This meter operates on an electromagnetic field. This field allows one to determine the amount of minerals in water. Water without minerals conducts electricity very poorly, while water with a high salt content conducts electricity very well.