A pad or phone with a built-in magnetometer and Physics Tookbox Suite installed would tell you the orientation and strength of the magnets.
I've used it for just this purpose.
That's more like it !
Secret skills should be along the lines of Adele running really good Runequest campaigns or Stormzy being the reigning South-East England Yahtzee champion
Bought quite a few basses from Ebay, never had any problems at all.
All the vendors have been pleasant, everythings been as described.
If I can I'll collect in person, but I've never had any issues with shipping or couriers.
I think I once read 'We built this city' being described as a 'bunch of people in a room with a synth and a big pile of coke...and only one of them knows how to work the synth'.
That said, I still like it.