I have two enlargers. I have more than one enlarger timer, but I really like the StopClock, so I built the switch in the "before" picture so that I could control either of them with the StopClock without unplugging and replugging. Then, the power strip came into play so that I could shut off power to everything with one switch. (Both enlargers, all safelights, and timer) All this was plugged into the wall (mains) through a surge protector. Well, it was messy, so I got a wild hair and built this switching unit. The surge protector is internal, and there is a main switch to shut everything off. I still have both enlargers set up with the one timer.