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.
The browser. A surprising amount of my billable hours is googling the manual of some obscure thing someone else sold our customer and they want to feed the signal to our system and then reading aloud how they connect the thing.