HORIBA's OM Series field-type DO meters provide thoroughly accurate readings of DO, O2, saturation ratio, and temperature. When used in conjunction with a laboratory sensor, accurate biochemical oxygen demand (BOD) measurements can also be obtained. The OM series is designed to resist water damage under field conditions, enabling its use in the most rigorous of environments. These DO meters are suitable for use in a wide range of fields, including laboratory research, and mining, agriculture, forestry, and fishery operations as well as water quality management activities at production facilities.

An automatic atmospheric calibration function makes the OM Series ideal for field use. For laboratory use, two-point automatic calibration is available to meet high-precision research needs.

A salinity concentration compensation function enables accurate measurements to be taken of seawater samples.

A saturation ratio mode is provided for calculating the excess oxygen absorption capacity of a water sample at a given temperature.

DO electrodes have an automatic temperature compensation (ATC) function, thanks to the incorporation of a water temperature thermistor.

An automatic atmospheric pressure compensation function adjusts for changes in atmospheric pressure upon calibrating, ensuring accurate calibration even at high altitudes.

When used in conjunction with a laboratory sensor, the OM Series DO meter is capable of accurate BOD measurements and is able to take measurements based on large volumes of data over long periods.

Five different main body/sensor combinations are possible.