The calibration drift check of a water quality monitor sensor for disolved oxygen, during a site visit. The specific 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. Was the Salinity correction applied? The date and time of the water quality monitor inspection. The code indicating if the sensor wiper was cleaned or changed. Was the Dissolved Oxygen Membrane changed? The date (no time) that the dissolved oxygen membrane was changed, if changed. The duration of time the dissolved oxygen membrane was allowed to relax, in minutes. Comments regarding the dissolved oxygen sensor calibration.