@happyborg The problem with SWITCHING inductive loads is that they give the relay terminals a hammering. I can't see any problem with monitoring them using such a plug, provided you're not planning on switching them. It's something that's made me a bit edgy, though - I'd like to monitor, eg, my fridge, but really, really don't want some glitch to end up switching it off without my realising! It'd be nice to have a plug that monitored, but didn't switch.