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? Thanks John jheimann@sc*.gt*.co*
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