Comment More stuff for your tool kit (Score 1) 416
There are a lot of truly good lists in this thread. To keep my posting brief, I Iimited my response to ten items I use but did not see on the other postings.
1. A cabinet with a combination lock big enough to hold your tool box so your tools are actually there when you need them.
2. Duct tape and electrical tape. - Seriously. In multiple colors.
3. Cable ties and scissors to cut old ones. (No, not a razor knife. You also need one of those.)
4. A label-making machine (like the Brother P-touch to label every device and cable)
5. Gauze, medical tape, and band-aids. Small wounds should not slow down large repairs.
6. A telescoping magnet. Screws will fall!
7. Extra multi-outlet strips and extension cords to hold you over until the electrician shows up a week from now.
8. Fine point sharpies in multiple colors.
9. Wrist-wrapped grounding wires
10. A magnifying glass to read service tags mounted far away with tiny serial numbers. (Although there are now phone apps that sort of work ok.)