And the second thing would be just to improve the lag time between grasping the handle and the deactivation of the magnet, so I can just lean down and casually grab it, instead of having to hold it for a second before bringing it up. The more magic, the better.
Still, this is pretty awesome!
Just try with a magnet on your fridge door. It's much easier to slide it around than it is to pull it away.
A Pro Mini draws a tiny amount of power, I'm talking tens of milliamps- he could leave this hammer somewhere for weeks probably without the batteries dying, with the occasional passerby trying and failing to pick it up. To manage that with the magnet running constantly would be impossible.
If you like this kind of stuff, check out Colin Furze's youtube channel. He does some similar experiments, and is very entertaining.
It'd be pretty hard to fit all that in a small package though, and probably dangerous.
Or just inject the rfid chip under your finger.
He used the "Light and Heavy Chest" to demonstrate his ability to remove the strength of men for political ends.
But it's still awesome.
I can't help but wonder if you could beat the magnet by kicking the handle sideways, the strong impact multiplied by the lever force might be enough to beat it.
Also some credit cards have warnings to not put near magnets, but maybe the magnet's not strong enough to do damage