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.
The amount of oxygen dissolved in water is expressed as a concentration, in milligrams per liter (mg/l) of water. Dissolved oxygen levels are also often reported in percent saturation. Temperature affects DO concentrations, and calculating the percent saturation will factor out the effect of temperature.The saturation level is the maximum concentration of dissolved oxygen that would be present in water at a specific temperature, in the absence of other factors.Scientists have determined the saturation DO level for various temperatures. Saturation levels also vary with elevation.emperature affects DO concentrations, and calculating the percent saturation will factor out the effect of temperature. The saturation level is the maximum concentration of dissolved oxygen that would be present in water at a specific temperature, in the absence of other factors.