Quote: (Originally Posted by
Flup)

Oxy gauge and Air ZO2 for the monitoring of the oxy level.
Been there, done that. The Oxy2 with AirZO2 don't work well in CCR use.
They will measure the oxygen content in the bags when it switch on, then every time the FO2 (not the PPO2) drops (as when you start to descend and you add diluent) it assume you are overbreathing and give you more deco to do.
At the end of a normal dive, you will accumulate a huge amount fo deco time that you know is not necessary. But if you don't respect it, the AirZO2 will hang ("SOS" mode) for one day and you will not use it the day after.
So you will have to follow the infinite deco it prescribe or you will have to hang it under the boat to let the AirZO2 finish his deco or you have to use two AirZO2 every other day...