| Model | 499ATrDO | Dissolved Oxygen Sensor - Trace DO |
| Transmitter compatibility | 54 | Rosemount 1056, 1066-DO, 56, and 5081-A compatible |
| Cable options | 06 | Integral 100-ft. (30 m) optimum EMI/RFI protected cable |
| Flow cell option | 70 | Includes low flow cell |
| Calibration and conformance certificates - optional level | CC | Certificate of Calibration (no test data given) |