For the municipality of the same name in Gloucester County, see Monroe Township, Gloucester County, New Jersey.
How to measure dissolved oxygen. Dissolved oxygen is measured using a dissolved oxygen meter. The best method is to take the measurement in the field at the same time each day because DO concentrations can vary throughout a 24 hour period.issolved oxygen (DO) is a measure of the quantity of free oxygen molecules in water.
How is dissolved oxygen measured? DO concentrations can be reported as milligrams per liter, parts per million, or as percent air saturation. 1 milligram per liter is equal to 1 part per million. 100% air saturation refers to the amount of dissolved oxygen that would be in water if it were completely saturated with air.