Stethoscope - Yes. Love it. Cherish it.
Oto/ophthoscope - It obviously depends on your school but most schools will have ophtho and otoscopes as well as BP cuffs in the clinic rooms and SP rooms. Most people I know bought all that junk (myself included) and then never used them except to unpack them on day 1 of delivery. If your school has standard exam rooms you can get by with only a stethoscope.
Reflex hammer - I don't use mine for testing reflexes. I use it to establish for myself on a nearly hourly basis that I can, in fact, still bend over to pick up an object that inexplicably falls out of my pocket while leaning even at a 45* angle from vertical. I now keep it in my backpack and rarely use it. You can use your stethoscope for DTRs if you practice. The ones with the disk-shaped tops are pretty nifty... but thats just more big stuff you have to carry around.
Pen light - maybe.... the otoscope attached to the wall has a light and works pretty good for checking pupils and such. That said, I still have one.... somewhere...
sphyngomomomo... sphyna.... BP cuff - again, it should be on the wall in most places. Rural volunteer clinics will usually have a few they keep with their supplies. In most hospitals the nurses will do vitals when they come in (for outpatient) or they will be hooked to a machine that does it at intervals (inpatient). I only recheck BP if I have some reason to doubt the machines reading. I have yet to find a situation where I have been in need of a cuff and didnt have one nearby.
Tuning fork - a greater escape artist than the reflex hammer. There is usually one around if you need it, and there are other things you can quickly do without one to determine if you need one or not.
My white coat usually contains my stethoscope, my EKG caliper (the cheapo from amazon), a couple cheat sheet cards that Ive been given along the way, a couple pens and a highlighter, a small notebook, and my folding clipboard (which has cool stuff on it, but I haven't used it for much other than writing on during histories). I've found that a good majority of the stuff you need for physical exam is either on the wall in the exam room, in a drawer in the room, or in a secret stash in the department that a nurse could point you to.
