I don't know about Rangier's guage, but the Enerac I posted can read 0-25% O2 (total, not excess). They are $$$ though, and the O2 sensors need replacing every year or two (the latter is probably the same for RR's sensor).
EDIT:
As for particulate
There is ~$300k of equipment in this image, not including the 4x4. Most of it is to measure (diesel) particulate.


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