SEFRAM 7314 User Manual page 36

Note - Press HOLD button in MIN MAX mode to make the
Meter stop updating the maximum and minimum value. When
display Hold mode is nested in MIN MAX mode, the MIN MAX
mode must be released before the display Hold.
Display Hold
Note - Press the Hold button to toggle in and out of the display
Hold mode. The MAX / MIN feature is unavailable when display
Hold is active.
Auto Power Off (Battery Saver)
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