The ON/AUTO/OFF button on the Programmable Timer
allows the operator to manually turn the sampler on or off
(or to place it in the "Auto" mode in which it is controlled by
programmed on/off sequences). As the ON/AUTO/OFF
button is pressed, a bar at the lower edge of the LCD
display moves horizontally over the words "On", "Auto"
and "Off" which are printed on the timer case