What the?? Air on or off???

[DiveCaptDean]

While i dont think its a "bad" idea...i personally dont feel the need for it.  This is not to say that others would love to have something like this.  It might be nice to see used on a cattle boat in the tropics somewhere just for the crew to have a quick glance method of checking valves.  I would have the concern of complacency...if green means go and red means stop....would people still do their pre-breathes and pre dive safety checks?...I personally breathe my regs for 5 to 8 breaths before hitting the water and then 3 or 4 more prior to going under..I guess that why i personally wouldnt use it...but again..i can see its function in typical recreational diving...
g/l
Deano