.<SNIP>         The UBS O2 stick doesn't have a restrictor and is used by
pressing it
> against the O ring at the tank's yoke with non-DIN tanks.  I've seen it
> used and it seemed accurate, but I'm very uncomfortable with the
> possibility of variability of flow rates, and currently, I don't feel
> competent to use it to the standard I'd like to have.  It's available for
a
> little over $200 and the promoters say it's good for at least 100 dives
and
> can take a fair amount of abuse.  UBS also sells a PrO2 oxygen analyzer
> which comes in a box like the MiniOX I, but seems to be a lot more
> rugged.  It sells for about 50% more than the stick and is available with
a
> restrictor.
>
Thest are the two I have run side by side and (once you learn to control the
flow rate on the stick) they give close enough to the same readings as to
not matter.  IMO, the PrO2 ias a better buy.  It is a lot more rugged and
does have the flow regulated as well as having a replaceable O2 sensor and
battery.

CH

.