Here are a couple of things I could do with:-
1) A set of screwdrivers with a slide switch in their handles to magnetize<->de-magnetize the tip!
2) Similarly, a sonic screwdriver would be nice ... but failing that, a switchable vibrating tip to assist in freeing up small dirty/seized/stiff screws (hint:- maybe we could adapt an old dental scaler for this).
3) A meter to measure (low levels of) magnetism at a fixed distance. I have in mind a thimble (or bell) shaped piece of plastic with a Hall-effect detector and wires going off to the meter. Its purpose would be to give go/no-go values for fixed magnets such as those used in infusion pump door sensors. Maybe one could be knocked up from bits off an old pump (eg,
Ivac 590 series).
4) Another thing I would find handy is what could be called a "universal mains power switcher" ... a multi-timer (programmable) mains socket but with options to switch on/off by temperature (and possibly other criteria
also) as well as time(s). This one could already be available (eg,
on eBay) for all I know. I'll do some research when I get a bit of time.
I guess it's a bit late to write to Santa. But I wonder whether one of Santa's Little Helpers has been delegated to check the emails. Or even ... SMS?