Pentax PLP-602R - Manual (Page 15)

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1.4 Battery insertion
Battery insertion for the instrument
Turn the detaching knob for battery cap counterclockwise and remove
the cap from the instrument.
Insert 4 pcs D type batteries into the battery box according to its
(+) and (-) marks. (PLP-601 / PLP-602)
While holding the instrument with one hand, push the battery cap into
the battery box and attach it by turning the knob clockwise. 1
2
3