SEFRAM 7351 Manuel D'utilisation page 33

DIGIT :
Press the DIGIT button to select the display digit.
AUTO HOLD
In the Auto Hold function, the meter holds the reading, and the
current reading appears on the upper display. When the differ-
ence of the hold value and the current value above 20 counts,
the meter beeps and holds the new value. To use the Auto Hold
mode, press the A-Hold button.
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