mattwave:
I second that, who thought it was for checking during the dive, come on people.
Dude, I have my buddies squinting at that little thing all the time, I don't know what you are talking about. I also perform OOAr (out of argon) drills regularly, where I shiver uncontrollably and then rip my buddy's inflator hose off their chest--unfortunately, I often take the inflator valve with it. I need to get a bit less aggressive (but I have a great collection of slightly used inflator valves if anyone needs one). If you aren't practicing this stuff regularly, well, then, I think you are going to die of hypothermia.
Forget monitoring your buddy's breathing gas supply, that was so 2006. Monitoring your buddy's argon supply is where it is at now.
That being said, I'm running out of people to dive with, they all get angry about the holes in their drysuits left from my OOAr drills. So, since I am forced to become a solo argon-using diver, I'm thinking of getting that new wireless argon gauge setup, it will calculate your consumption rate, transmit your argon status to two different computers at once, and has various levels of conservatism built into it. It also will translate five different languages, has instant messaging and comes in five different, strokalicious, colors. My only concern is that it seems easily bendable, and I don't want it to lock me out on multiple dive days . . .