VEVOR EM4556 - Data Hold Functionality; Audible Alarm Function Control; Auto Power Off Feature

When the tester is turned on, the audible alarm function is on. The
display shows the symbol " " as an indicator.
Briefly press the " " button to enable or disable the audible
alarm function. When this function is disabled, the symbol " " is
shown.
7. Audible Alarm Function
Long press the " " button to enable or disable the automatic
power-off feature. When the display shows the symbol " ", it
means the auto power off
is on.
Without any button press in about 10 minutes, the tester will
automatically power off.
8. Auto Power Off
Briefly press the " HOLD " button, the current reading is locked. The
symbol " " appears on the display.
To unlock the reading, press the" HOLD " button gain. The symbol
" " disappears.
6. Data Hold
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