Prokit's Industries 3PK-9912 - Manual (Page 6)

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“VHz” jack
This is positive input terminal for volt and frequency measurement
connection is made to it using the red test lead.
“COM” jack
This is negative (ground) input terminal for all measurement modes
except current. Connection is made to it using the black test lead.
“ Ω” jack
This is the positive input terminal for ohms. Connection is made to it
using the red test lead.
FUNC. button
The button is used to select or testing in / range and to
select ACA or DCA in AC current ranges.
Trigger
Press the lever to open the transformer. When the lever is released,
the jaws will close again.
DCA ZERO
Adjusting the DCA ZERO knob, when the display is not zero reading
for does not measurement before.