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@ryanc @kajer @davidmc @zesty It probably does, just not labeled that way. Current mode is low impedance. The downside is if your multimeter isn’t fused, measuring wall current with current mode will probably show ~15A for about five milliseconds, then your multimeter melts and/or explodes.

This is the only real downside to the demise of incandescent bulbs. Loose sockets are cheap. You could stick one plus a switch on a board, hook the mystery wire to the switch, the other end of the switch to one terminal on the light socket, and neutral (or earth, if neutral isn’t available) to the other terminal of the socket.

If the bulb doesn’t light, there’s voltage on the wire, but not much current. If the bulb lights, there’s current.