Just a word of warning, the sensor which I've been using for a few years now has the sensor head soldered to a small pcb. The contacts are slightly exposed, depends on how well they've added the heatshrink. It's very easy for these to touch the magnet shorting the sensor, whilst in setup. I've done 2 before I realised what was happening
Added a small amount of goop to cover them and stop them going short circuit
Added a small amount of goop to cover them and stop them going short circuit

