It checks the supply power point has been wired correctly and indicates if it is safe to use or not. If the red light comes on, don’t plug anything else into that outlet (and do the right thing and let somebody know so it can be fixed).
It checks the supply power point has been wired correctly and indicates if it is safe to use or not. If the red light comes on, don’t plug anything else into that outlet (and do the right thing and let somebody know so it can be fixed).