An Online Dissolved Oxygen Controller is used , to measure and control the level of dissolved oxygen in a liquid, controller processes the signals of sensor and determine the current level of dissolved oxygen , If the level is low it activate an aeration system to introduce more oxygen, If it is above , the controller initiates corrective actions. Dissolved oxygen range=0.0 to 20.0 mg /L; Dissolved oxygen Calibration points=1-2-points; Dissolved oxygen accuracy=± 0.5 mg / L; Dissolved oxygen resolution=0-1-mg-l,for more visit Labtron.us