A multimeter is absolutely a good thing to have. Even for small electronics, you can do simple diagnosis like if a wire is broken, if an audio jack fucked, or even if a battery has any charge left.

That’s where this insect family gets its latin name: Dermaptera, i.e. “skin wing”, as the wings are usually hidden under a leathery flap. They also are super complex in the way they unfold from under these flaps.

Also, earwigs are completely harmless and cool and should be left alone. If anything, they can be beneficial in gardens, as they hunt other, harmful insects.