Freedom computer can be used as a nitrox analyzer if an oxygen sensor is attached. Just order Freedom Nitrox analyzer.
The analyzer is supplied WITHOUT an oxygen sensor. Use Divesoft R22S oxygen sensor with Molex 3-pin connector (or equivalent). Oxygen sensors previously used in rebreather (type R22-D) can also be used in the probe, if they are still able to measure full range of oxygen pressures in atmospheric pressure safely.