If you eventually do get into rebreathers, keep in mind that the Petrel (without the Fischer cable connector) can only run a fixed setpoint. That is, it will not monitor your machine and will not alter your decompression profile based on your actual PPO2, so the impetus will be on you to hold the machine tightly to the fixed PPO2 you configure in the unit. It's obviously better two have two computers wired to the unit, but it's not required.
If you opt for a Petrel with the Fischer connector, you'll have to make sure that whichever CCR you purchase is compatible with that type of connection. It is likely that you will end up buying whatever electronics come with your CCR and using the Petrel as a back-up to your primary electronics.
If you opt for a Petrel with the Fischer connector, you'll have to make sure that whichever CCR you purchase is compatible with that type of connection. It is likely that you will end up buying whatever electronics come with your CCR and using the Petrel as a back-up to your primary electronics.