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Greg,

I've had a Monitor III (an Air-X by USD) since it came out. These devices 
read cylinder pressure transmitted via a low-frequency radio signal. This 
signal has been very reliable for me, however, a strobe or the motor from 
a scooter _can_ disrupt the signal from the tank unit (sender) to the 
wrist unit (receiver). It's easy to fix, though. I've talked to several 
Air-X divers who are photogs and they have found that moving it a foot or 
less up your arm _away_ from the source of radiation/interference 
resolves the problem. I found the same thing in using my scooter. I was 
getting interference, so I moved it up my are about 6-8" and the 
interference stopped. 

Of course, losing the pressure info doesn't affect the computer operation 
in any way and the info that is lost is regained once the connection is 
re-established. I'm wondering what constitutes a "failure" of these units 
in some of these posts. Are we talking radio signal interference or 
actual shut-down or misinformation from the unit. If you're traveling by 
air they often _will_ show a pressure/depth change on landing as they 
readjust to the pressure of the cabin (they're supposed to do that), but 
they should readjust themselves. 

You might want to run this by the Uwatec techs and get their opinion on 
other problems.

JoeL

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