A multi purpose tool lika Leatherman is kind of a self evident choise, but interviewing some technicians we found more alternatives for a lighting tech on a desert island.

Bost Unihandle for bits

"You can access places where it is really tight for space, and it really just lasts forever"
Ted Kvarnström (Service Spectra)

Universal Pliers with automatic lock

"The best allround tool Iäve had. Replaces pliers, wrench and polugrip"
Robban Olsson (Spectra)

Weller Pyropen gas soldering iron.

"Stays hot up to 90 minutes, and works really well"
Tobias Österberg (Service Spectra)

Fluke Spectrometer, in other words an oscilloscope and general measuring tool with a high price tag and some seriously good quality.

"Check the output of a ballast, or follow a DMX signal inside a moving light"

Micro DMX tester from Artistisc License.

"Small and really useful"
Ted Kvarnström (Service Spectra)

The left tool is a universal polygrip. I'm sorry to say it broke down on me but it was great while it lasted. The other is a ring key with the advantage that you never have to set the direction. Just change the direction.

Anders Larsson (Dramatical Institute)