I don’t just mean a wrench, unless thats it for you. I mean any tool you regularly use for work that you consider your most important. If you’re a software person name whatever digital tool you guys use. Whatever the career everyone uses tools I dont care if they are digital, verbal, physical or psychological. For me its honestly probably a flashlight, before I use any tools I’m always investigating with my flashlight or using a laser to trace lines.


My Fluke Intelatone copper cable tracer and pin mapper. Had one as a company tool back early in my career. Bought one for myself when I moved and just carry it around in my magic bag of tricks. It is just the best at finding its other half, so much so that ive had multiple employers buy their own because I use my own and wanted me to stop using the shitty cheap ones they get off amazon.
Fluke is THE standard.