A reading taken from the specified monitor sensor where that reading is checked against the reading from a field meter sensor to verify the accuracy of the monitor sensor reading. The Code indicating whether the check reading is before cleaning, after cleaning, or after calibration. The date and time of the sensor check reading. The value of the sensor check reading. The units are the units of the sensor, unless otherwise specified. The Code indicating a remark about the value of the sensor check reading. The field meter sensor that was used to check the validity of the monitor sensor reading. The value of the field sensor reading performed to check the monitor sensor reading. The units are the units of the monitor sensor, unless otherwise specified.