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1-3 Key Function
1-3-1 BLUE KEY : Push the Blue key to choose among
Auto AC/DC, AC, DC, and AC+DC measurement.
Auto AC/DC mode (AC or DC flashing):
Display Measurement result at AC only with RMS value or
DC value, it depends on whichever is greater.
AC mode : AC only with RMS value.
DC mode : DC value.
AC+DC mode : AC+DC RMS value.
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