Dissolved oxygen (DO) is an important determinant of water quality.  For example, DO of industrial wastewater is commonly monitored prior to discharge to ensure compliance with quality standards, and in aquaculture, DO is frequently checked to ensure the welfare of captive fish.  DO meters use a sensitive electrochemical probe to generate a value for the amount of dissolved oxygen in water.  Various models are now available to suit particular applications.  Contact us regarding your requirements.  We look forward to making a recommendation to match your needs.