Spectrum Masterâ„¢ MS271xE User Guide : Instrument Overview : Mode Selector
 
Mode Selector
To change to another operation or measurement mode, press Shift, then the Mode (9) key to display the Mode Selector list box, illustrated in Figure: Mode Selector List Box. Use the directional arrow keys or the rotary knob to highlight the desired mode, then press Enter to switch to the selected application. The measurement modes available for selection depend on the options that are installed and activated on your instrument.
An alternate method of selecting a measurement mode is through the use of the Menu Key.
Mode Selector List Box