Hi Scott,

My instinct based on experience tells me both your sensors are OK.

If you notice the deviation of one from another, they're within a few percentage points, but the deviation from the FAQ is what you're concerned about - tenfold of that.

Remember FAQ is not FACT. And those readings, which I suspect are approximated by someone running his finger up the semilog plot in the green book and calling off easy to remember round numbers, are sufficient for blessing the FI equivalent of the choke bimetal.

What I know of NTC thermistors is they don't normally degrade out of tolerance, just the real world creeps up on them in the form of opens and corrosion, problems you'll discover easily comparing with those numbers quoted in the FAQ, if a little common sense is applied.

How did you thermally couple your thermocouple meter probe with both sensors and what did you do to mitigate time differences switching to resistance probes on two separate devices under test?
--
Art Benstein near Baltimore

There is no psychiatrist in the world like a puppy licking your face.
-Ben Williams