program update on the ATU-Pro3 and 4
all units now sold have been updated to allow customer selection on the sensor type fitted - eg: infrared or capacitive
the big advantage here is that should you wish to change the sensor type selected by the ATU then it's simply a case of a sequence when powering the device
the only extra cost would be in the replacement sensor itself
this is to attempt to future proof any updates to your original purchase at minimal cost!