The calibration drift check of a water quality monitor sensor for disolved oxygen, during a site visit. The specific location sensor (disolved oxygen) installed on the water quality monitor being inspected. The salinity during the dissolved oxygen calibration check. The change in dissolved oxygen during the dissolved oxygen calibration check, in milligrams per liter. The dissolved oxygen charge gain during the dissolved oxygen calibration check. The date and time of the water quality monitor inspection. Comments regarding the dissolved oxygen sensor calibration.