On Tue, 24 Nov 2009 12:08:37 -0800, "Steve B"
wrote:

Does anyone have or use one of these? I have yet to find a good O2 sensor,
but did find a good product called Clinefinder for temperature sensing,
which the reviews tout highly. But the O2 sensors don't rate high, and one
with a 50 or 100 foot cord seems to be spendy, although I haven't found one
yet.

I will say this - outside of lab quality dissolved oxygen sensors,
they ain't worth crap to be honest.

They work on the same principle as the thnigy they put on your finger
in the hospital.