Some units utilize a tech simply to watch the central monitor and answer phones. In smaller units they do that plus the FBS's, check and draw am labs, assist with turns, etc. In some units, with alert patients, they can do the history part of the admission HP and set up the room, attach monitor, sat and BP cables, etc... til the nurse gets there.
So there are lots of potential uses for a tech in a unit. The problem I've run into? If we get a tech, inevitably they want us to triple patient load.
So...my colleages and I have opted to do primary care, work together in a team environment, and insist on 2:1 ratios.