| Document Code | Date | Description |
|---|---|---|
| M211486EN-E | January 2019 | Updated information on the OIF411 ID data. |
| M211486EN-D | January 2018 |
Added lithium battery option for ECC-6A ozone sensor and information on KTU-3 Ozonizer Test Unit. Information on the radiosonde EPS covers was added. |
| M211486EN-C | December 2016 | Updated information on securing the unwinder attachment for the sounding. |