KYORITSU 3323A - Manual (Page 19)

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DANGER
Never open the Battery cover during a measurement.
WARNING
To avoid possible electric shock, remove test leads before
opening the Battery cover. After replacing batteries, be sure
to tighten up the screws for Battery cover.
CAUTION
Do not mix new and old batteries.
Install batteries in correct polarity as marked inside the
Battery compartment.
(1) Set the Range switch to "OFF" position, and remove the test
leads from the instrument.
(2) Loosen the Battery-cover-fixing screws, and remove the Battery
cover. Always replace all 6 batteries with new one at the same
time.
(3) After replacing batteries, be sure to tighten up the screws for
Battery cover.
7．Battery replacement
Battery-compartment-cover-fixing Screws
Install batteries in correct
polarity as marked inside
the battery compartment.