The DO Transmitter, or Dissolved Oxygen Transmitter, precisely measures and relays dissolved oxygen in liquids. It uses galvanic or optical sensing. Galvanic sensors rely on an oxygen - electrode electrochemical reaction for current generation, while optical ones use fluorescence quenching by oxygen. In aquaculture, it ensures fish survival by maintaining proper oxygen. Wastewater treatment plants use it to monitor aerobic process efficiency. With high - precision detection down to low oxygen levels and easy calibration, it gives consistent results. Its waterproof and corrosion - resistant design allows installation in various liquid systems to transmit real - time data for oxygen - process control.