If you could only power 1 device ?

[MathWizard]

If you could only have 1 piece of 'factory grade' test gear for the rest of your life, what would it be ? A DMM? An oscilloscope ? A PSU

I'd want the scope

[Specmaster]

I'd go with a DMM as it would be used far more than a scope.

[tautech]

A DSO for sure.

[MathWizard]

You know I forgot about resistance measurements and stuff, a scope would be pretty, a scope way more work, to measure stuff.

[rstofer]

In my view, of conventional tools, the scope!  Once signals start wiggling, we get interested in how they wiggle.  Signals that don't wiggle aren't interesting.  The DMM is  useful, no doubt, but it is useless for SPI decoding or making an FFT.  I'll concede that it is possible to get a Bode' Plot out of a DMM but you would have to have a signal source and that breaks the rules of the game.

Only one gadget and allow for non-conventional?  Definitely the Digilent Analog Discovery 2 (if they ever become available again).  I have one and for 'learning' electronics, they are the best tool for the task.  It gets far more use than my bench instruments.

[Brumby]

A scope is pretty and nice and useful (and impressive to visitors) - but how many times do you reach for a multimeter versus the number of times you use a scope?

[tautech]

A scope is pretty and nice and useful (and impressive to visitors) - but how many times do you reach for a multimeter versus the number of times you use a scope?

Well you can have both in a single device:

[Fungus]

There's not much point in having any of those without a power supply to power the DUT.