I have an old meter called Thermocouple Milliammeter.
It is not for temp reading, but the input current raises the temperature of
the input resistor, whose temperature is sensed by a thermocouple driving
the D'Arsenval meter movement.
Would you call this a real True RMS meter?
Clarence P. Bennett
bennett@oakland.edu
Oakland University Physics
248 370 3418
Rochester, MI 48309