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This might be worth a try. They did not publish a clear picture of what I'm considering. But if the metal chamber wall I can see through the vents is really the chamber wall (i.e. not a double wall ) I should be able to place a thermocouple on the outside face of the shroud. Not as good as actual air temp - time lag of the wall, plus deficiencies in measuring surface temps, But perhaps a place to start. I may disassemble the base and inspect the construction. I have a couple thermocouples that came with the Amprobe TMD56 - I just need to find some of the tape to secure the thermocouple to the chamber wall.