KYORITSU 4202 - Manual (Page 19)

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9. Battery replacement
# WARNING
In order to avoid possible shock hazard, take off the instrument from the
conductor under test and turn off the instrument before trying to replace the
batteries.
# CAUTION
Do not mix new and old batteries. Never use the different kinds of batteries
at the same time.
Install batteries in correct polarity as marked inside.
When the battery voltage warning symbol " " is displayed on the upper
left of the LCD, replace the batteries. Note that the display blanks and " "
symbol is not displayed if the batteries are completely exhausted.
(1) Stop measurement when the warning symbol appears, and um-clamp from
the object under test.
(2) Ensure that the instrument is powered off.
(3) Loosen the Battery cover-fixing screw on the back of the instrument.
Then remove the Battery cover.
(4) Install new batteries (LR6 or R6P: 4pcs) in correct polarity as marked inside.
(5) Put the Battery cover in place and tighten the screw.