Once upon a time, AC/DC adapters were special — they were made for expensive devices and were clearly labeled as belonging to those devices. No more. Now, every device comes with an adapter, most of them are nothing special, and the adapters are hardly labeled at all. Furthermore, they have mysterious round plugs that (unless you have calipers handy), you probably can’t tell apart. You could go around trying to match voltages and currents, or you could just label the damn things when you get them.

If you’re part of the GTD cult, you should already have a labeler. Just print out short, simple labels and stick them on!