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.

I am a normal person and use a multimeter all the time to check batteries and fuses.

I hired an electrician to rewire an outlet under my sink so that the switch above the sink can control only one of the two plugs. When he was done, I used the outlet tester and found that he hadn't properly connected the ground wire. I wasn't planning on connecting an appliance that needed grounding, but I think every outlet in the house should be grounded anyways as a matter of course. Got him to fix it before he left. That $9 I spent 7 years ago paid off as far as I'm concerned.