First, I should admit that I have both control issues and issues with systems. In other words, I like to do the best work in the most expedient manner. In particular, I don't like to find myself short of the items necessary to do my work (in any work context).
I'm a student. In my clinical rotation in LTC, we could bring in our own things. Oximeters, bp cuffs, etc. Frequently there was not enough equipment to go around and this made our impact on staff less annoying and allowed us to do vitals more quickly. I'm wondering, though, if the same is allowed in hospitals (and I can see reasons why admn may not/wouldn't like it).
Also, if you CAN bring in some of your own equipment, how do you carry it without contaminating, etc. For instance, I would love to be able to carry a small pulse ox and my bp cuff, and a thermometer with extra sterile sheaths, extra alcohol scabs (in packages) around with the "normal" equipment, steth, scissors, tape, penlight, etc. I doubt the capacity to put all of that in my pocket, however. Given that I'm not a kangaroo.
I already carry my own bottle of hand sanititzer.