Checkline DT-326 - Manual (Page 6)

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2.2 Removal of protective sheet
Remove both protective sheets covering the operation panel and light source as shown below.
2.3 Installation of Battery
Turn coin screws counter-clockwise to remove battery cover, and insert batteries in proper polarities as shown
below:
* Avoid battery leakage/ corrosion when not in use for extended period of time.
Coin screw
Battery cover
Operation panel
Light source
Protective sheet