I carry both.
I'm no electrical whiz, but it's nice to be able to test fuses, circuits, wires, switches, and all you really need to do so is a few bits of common sense. A tester can also tell you whether your battery is dying, plus more along those lines. You want to learn, or stick with what you already know? Not all travel is strictly geographical.
You need some means of inflating a tire. In fact, I'd say you need TWO means of inflating a tire, but that's because I've had both hand pumps and electrical inflators die on me. Tires go flat due to punctures, rotted tubes, rusty rims, bad valve cores...and all require re-inflation. I (once) had the sad experience of pushing my loaded bike with its flat tire for a mile or so, and I'd like to not repeat. On the other hand, I've also had the experience of a tire suddenly going flat right across the street from a tire repair guy--handy, but somewhat suspicious.
Hope that's helpful.
Mark
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