Thanks Eddie

Currently I have just entered the thickness of the plate into UCCNC somewhere or other. So if I was to get the Sorotec one, I could measure it to the point it activates the switch and enter it in this same box.
Perhaps they supply the measurement with it ? Otherwise I suppose a bit of trial and error for the first set up then its done.

Do you think it would solve the interferance problem I am having?

Any other switch type ones recommended ?

Ollie