Im an industrial mechanic. Exophyusical and Bobcatdan both said it well. I keep a toolbox "just big enough" full of tools I use and I do push my box around our plant when the going gets real tough, but most of the time I can work out of my tool bag. I keep a Klein 11-1 screwdriver and a CMAN 10in adjustable wrench in my pocket, they come in handy often. I keep all my automotive specific tools at home of course as I may only touch a forklift every now and then, and its usually a hydraulic issue if I am working on one. I could probably live with alot less than I have, and I dont really plan on adding any more for work. There is no way I could have a triple bay monstrosity at work, just no mean of transporting it and no room, as I go to the machines to work on them. There is a list of tools in my Millwrights and Mechanics Guide book that we were required to have when I was in school, tried finding it online but no luck. I know we had to have quite a few precision tools and sockets and wrenches up to 1 1/4" for sure. I worked at a Hydraulic Shop prior to my current job and I really didnt have to add anything in the way of tools.