Irrigation Moisture Switch, Model IL200-MS, controls irrigation by measuring soil moisture. Ideal for all existing irrigation controllers that do not monitor soil moisture or weather conditions. Just install switch in root zone to supplement irrigation controllers for landscapes, trees, crops, or vegetables. When adequate Dynamax, Inc., Houston, TXreaches plant roots, moisture switch interrupts controller schedule to stop irrigation. Can reduce water bills by up to 50%. As soon as soil dries out below recommended set point, internal switch closes and signals controller to continue irrigation as needed.