(WbSearch) writes:

Have a Micronta M/N 22-191 multimeter that recently won't display zero only on
DC at the 2 volt selection or higher. The 200 mv scale is fine, as are all
scales of AC volts. The display shows between 0.100 - 0.500 volts, even when
the plus and minus leads are touched together. I have cleaned the PCB and
switches which helped for a short time. All diodes, resistors, batteries and
fuses check fine. All other functions work properly as well. Any other help
is appreciated.
Also, does anyone know what the 2 POT's are for? The manual doesn't go into
that detail. Thanks in advance.

In any case, a sudden change in behavior isn't an adjustment.

I also have a DMM that reads slightly off 0 on just 2 or 3 ranges but is
otherwise accurate.

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