Thanks a lot to all of you!
PT100 Sensors have the problem of all of them being quite "big", but I am in contact with a manufacturer who might be able to supply a small enough Version of it.
Right now I am using the H and L parameters to finetune my thermistors, but this is a little frustrating to do as you can't just measure the temperature difference and enter it but need to work your way there. At least my thermistors all vary so I'd need to tune all of them.
If the sensor temperature is not the same as at the nozzle it does not matter as the deviation should be the same on every printer if the sensors (probably PT100) don't vary.
Yes, in RRF the G10, M104 and M109 commands accept floating point values for the temperature parameter.
You made my Day! I did not find any documentation this is possible and stupidly did not try.
But this leaves me with one Question: Is there a way to set it at steps 0f .1 of a degree? I dont want my customers to have to use the m104 command all the time.
Do you happen to know if there is a way to set them using a repetier server? (or using PanelDue)