Hello Geeetech
I purchased a Geeetech 3DTouch auto bed leveling sensor and put it up on my i3 Pro B according to user manual v. 2.0, everything seems to work but the Nozzen is around 5mm above bed.
I have corrected Marlin as described for GT2560 Rev A + (#define SERVO0_PIN 11 // 13 // untested).
What's missing here ??
Greeting
Aage