Plastic tab does not fit standard GFCI socket. Tested both on new socket and on d GFCI socket, same result. In order for it to fit into the socket, you need to break the tab. Otherwise, it's a nice, unobtrusive way to add some space for output. Since electronic pens now have built in surge protectors, I found I could actually use 4 sockets instead of 6, but that's better than 1-2.
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