I work on anything to big concerts to small awards dinners to running generators to running dimmers so I could be working on lots of different events and shows in a week I'm just trying to build up my tool case so I know I can try and handle any situation on site It depends on the type of lighting job I'm on as to what I'd call indispensable. The things I find myself using most frequently from my toolbox are: Quad Wingnutspanner AJ Swisson tester small/medium screwdrivers Other things I carry that I use on a mediumish frequency are Security/unusual bit sets Powered screwdriver cheapo gas soldering iron spares - M8, M10, M12 boltsets, fuses, couple of safeties, plus random bits I've picked up over the years spirit level sidecutters fine snips I do carry a 16-13 which comes in handy occasionally, but don't routinely carry connectors, as I'd normally just use another cable on a job rather than fix it in the field. I often think I probably ought to carry my multimeter with me but it's rare that I need to do fault finding on site at that level. I also have a nanoscope which sometimes comes in handy. I'm sure if I actually looked at my toolbox I'd see other things I've forgotten above that I use a lot but that's hopefully a good start. I also of course routinely carry PPE, sharpies, LX tape, USB sticks, plasters/mini first aid kit, a notebook and pens - but they're hardly tools. Hope that helps. What sort of lighting jobs do you work on and want advice for, specifically? My theatre work has slightly different demands from gig/corporate work, which is also significantly different from warehouse/maintenance lighting work requirements.