You really don't need much
Lots of black pens people will always manage to 'borrow' your pens with them mysteriously going missing! A red pen is always helpful for stuff during handover.
A fob watch, the rubber ones are really good as they're are so easy to clean
A note pad, a small one which fits in your pocket and doesn't way down your uniform
A pen torch is useful, even if your using it to search for hearing aids that have fallen out!!
If you want to you could get a stethoscope but to be honest you won't really use it much