Calculated Industries 4067 Pocket Reference Guide - Manual (Page 5)

3
Key Definitions
Basic Function Keys
O On/Clear Key – Turns on power. When not in a prompting
sequence, pressing once clears the last entry and what is
displayed. Pressing twice clears all non-permanent values.
Within a prompting input sequence, pressing once clears
the entry and leaves the prompt displayed. Pressing twice
exits the prompt function, but does not clear non-permanent
values. A third press clears non-permanent values.
Within an output sequence, pressing once exits the prompt
function, but does not clear non-permanent values. Pressing
twice clears non-permanent values.
o Off – Turns all power off. Clears all non-permanent memory.