In what location did I see the monitor?
On the black table with a phone and cleaning supplies near the wall.
On the gray cabinet to the left of the yellow cabinet at the white gate entrance, on the black table to the right of the white machine with a yellow board, and on the metal tabletop with a blue box and red tools on the aisle side.
On the black table next to the white machine with a blue box and red tools.
On the metal table with a laptop and various electronic devices.
On the gray cabinet near the entrance with a yellow board and blue gloves.