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.
Oxygen levels are best measured via an arterial blood gas test that also measures carbon dioxide and pH or, less precisely, with an oximeter, a device that clips on the end of a finger and shines a light through it. The color of the light coming out the other side is analyzed by a tiny computer in the device to determine your blood oxygen level.