Elenco Electronics M-2625 Operator's Instruction Manual page 15

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Figure 7. AC Voltage Measurement
Note: When taking a measurement of less than 20mV at the 400mV
AC range, the measurement value cannot be indicated correctly.
remain indicated. In that case, by pressing the REL∆ ∆ button, "0" will
Even if shorted, the input line at the 4V AC range, 1 ~ 3 digits may
be indicated.
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