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This color processor can develop both paper and films: Jobo CPA-2 Manual
Some processes (E-6, C-41, RA-4, R-3, ...) ask for a great temperature precision
and stability, to achieve it, I had to calibrate my CPA-2.
The objective is to obtain 38°C (E6, C41) or the specific temperature you need
for your process inside the development tank.
I filled the processor, bottles, graduates and tank with water and switched on
the processor.
I slightly modified the temperature until it stabilized at 38°C inside the
tank, this operation can be pretty long, after that, I measured the temperatures
at various places of the processor:
Tank: 38°C
Graduates: 37.8°C
Bottles: 38.3°C
Basin (close to the drain): 38.8°C
Warning, these values are those I obtained on my CPA-2 and may, of course, differ with yours !
To find back this temperature quickly, I just position the temperature control button on the mark done during the tests and fine adjust until the basin temperature reaches the value obtained during the tests.