It can measure the time that a master switch is on.
Either some one had cut the wires or opened the master switch.
A green light flashed on over the red master switch.
Jon reached out his hand for the master switch in the center of the Board.
I went around to the side of the bank, found the master switch.
They'd found the master switch and turned the fun house off again.
Mom threw the master switch and the sign came to life better than it had been in a few years.
His hand came to rest lightly on the red master switch.
A master switch turned on every light in the place.
Hit the master switch for the building lights if anything goes wrong.
