Nexus STANDARD MP V3 User Manual page 6

The Nexus Standard MP V3 has eight rotary control knobs and
two toggle switches.
Battery Test Toggle Switch
It is located on the front panel of the control box. It is used to
check the condition of the batteries by using the DDM.
The Battery Check of the MP V3 will indicate battery Voltage
between 10.5 V and 11.5V.
Full LED meter will indicate battery Voltage 11.5V or higher.
No indication during battery check will mean 10.5V or less in
which case the batteries will need to be put on charge.
Volume and Power On/Off switch.
This knob sets the volume of the tone and responses and it is
used also to turn on/off the Nexus Standard MP V3. This knob
should always be used for setting the volume. Any volume control
on the headphones should be set to MAXIMUM.
VCO Tone
This control enables the VCO multi tones on the MP V3. It is
recommended that the VCO control is set to the middle or where
the first green light on the led meter is almost turned on.
If the VCO knob is set fully anticlockwise this will give preference
to high tones, which can help in soil conditions where deep small
non-ferrous targets are difficult to identify. This setting will also
tend to bring some Iron targets to sound non-ferrous.
If the VCO knob is set fully clockwise (10), then low tones will be
dominant and small non-ferrous targets will sound in high
frequency closer to the search coil. In other words the depth of
4.