Panasonic 150A - Press % key and clear/stop at the same time, the meter should appear on the digital screen.

Panasonic 150FX - Press % key and clear/stop at the same time, the meter should appear on the digital screen.

Panasonic 150PA - Press % key and clear/stop at the same time, the meter should appear on the digital screen.

Panasonic D2500 - Open the front panel, meter should be in lower left corner

Panasonic D620S - Halfway down on the big door.  Or press utility button, meter count.

Panasonic 1510 - Press copy size and paper trays keys simultaneously to view the meter count.