My wife just came up with idea for a useful gadget.

So useful, IMHO, that it's very likely that an Asian manufacturer has already made one.

But I've never seen such a thing - perhaps someone else has?

It'd look like a small handheld calculator - say 120mm x 60mm x 10mm - but instead of doing maths it just records passwords.

Yes, I'm aware there are gajillions of apps for doing this, but, personally, I think it's crazy to keep one's passwords in the computer, because that's where any cyber-villain of even average intelligence would look first.

So I'd use one of these gadgets.

OK, I'm sure such a device would need a tiny amount of ram, which most calculators seem to lack, but 5mb say, would be cheap as chips nowadays (potato chips, that is).

Programming the thing could be tricky. No trouble if it was done with its own keys, but if speed-keen users wanted to program it on their computer, it'd have to be a USB device, which opens up the whole operation again to keylogging.

So, anyone seen one of these?