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    John asks

    I have an opportunity to buy a Vascular Technology Inc. (VTI) oxygen
analyzer
    with a VT 122 (disposable polarographic) sensor head for what seems like a
good
    price ($330).  It seems pretty similar to the Miniox III unit, and in fact
may
    be a repackaged Miniox, but has a longer warrantee on the sensor than the
    Miniox.  Does anyone have any experience, positive or negative, with these
    units?  Is there any reason why a polarographic (silver anode & cathode), as
    opposed to galvanic (lead anode, gold cathode), sensor cannot or should not
    be used for dive gas analysis?

Before buying this unit I would check on the tolerance of the sensor. In
medical applications the accuracy for oxygen % is less critical than 
nitrox or trimix use. I have the specs at home for the sensors used by
Teledyne and Miniox. I believe they are 2% if my memory is correct.

Regarding the meter itself. They are all basicly the same. They are
very simple over priced price devices. It is an Op-Amp circuit to scale the
output of the probe. Then an analog to digital converter to feed the LCD
display. Total construction cost less the probe ~ $20.00. I only mention
the construction to elaborate why I think there is not much difference
from one meter to the other. 

One other consideration would be, If they go out of business can you
still get replacement sensor. 

I also have an brochure on this unit if you would like me to get it to
you. 

I'm interested in know just how many manufactures sell O2 meters. I know
of Teledyne, Miniox, Aquatronic (sold through IANTD) and the VTIs meter.
If other people know of different manufactures I'd be interested in
knowing who they are along with any other info. on them.  

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