> A2: Chances are you'll be doing meters per second, as ventilation is
> usually measure in volume per time, and distance per time is readily
> converted to volume per time given the cross section of the tube.

No.
I've set it to kph as 1m/s = 3.6 kph so the instrument has a higher 
resolution in that mode.
Of knots, fps, m/s, kph - kph is the highest reading. Slightly higher 
than fps.

While the accuracy may not support the higher resolution, at very low 
air speeds the higher resolution is liable to be useful. I expect to 
be dealing with speeds of under about 6 kph in most cases.


        Russell




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