Adrian Tuddenham wrote:

Could it possibly be a semiconductor probe that uses the forward voltage
drop of a diode?

I checked the probe with both polarities of my ohmmeter. Also used the diode
test function to look for this.

The thing is that the temperature the device displays seems to work well
with a resistance decade box. And all the parasitics that introduces.

--
Paul Hovnanian
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Only through suffering comes wisdom. -- Zeus