I've used an old router power tranformer to check LEDs, fans and the like but these days I use this little box of tricks.
It's handy as you can just wire up the bare wires and allows you to switch voltages. 1.5A is enough for most desk duties.

It's handy as you can just wire up the bare wires and allows you to switch voltages. 1.5A is enough for most desk duties.
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