Jaycar QP5570 3.5 Digit LCD Panel Meter

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Last week from Jaycar I purchased a QP5570 3.5 digit LCD panel meter.  I
cannot get it to operate in a common ground application.  I require it to be
a 200 mV voltmeter.  The instructions and box that it came in say it can be
used as a common ground meter but do not say how.
Can anyone please assist?



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