@smaaash Just to be clear with 3.5.4 you will need both probes (or at least some way to home Z and set Z=0 other than the SZP). 3.6 adds support for homing by touching the nozzle on the bed and detecting this using the SZP, but be aware this feature is still classed as experimental.

@oliof There are linear hall sensors, but I don't know how sensitive they are. Passing a small magnet along the sensor would act like the rotary mag-sensors, but without the need of a motion translation.