I saw a Samsung ITS COMING SOON advert, and it was using the phone plus attachment, to scan for baby!
I said years ago, mobiles could easily be used to monitor or "power" devices. Obvs now we have massive 22k powerbanks to power, and mobile to view!
I've even seen kits for "probing" your own ear with a camera.... I think that's dangerous. Far worse than cotton buds.
No reason not to take temperature using an attachment, basically if it can be powered from low power, then the options for medical use is vast.
Now we have.pd powerbanks, with usb-c to usb-c cables, and can recharge as quick (or quicker) as plugged into a wall!