Bird Technologies APM-16 - Manual (Page 36)

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Storage
When storing the meter, keep an element or dust plug in the element socket to
prevent the intrusion of dust and to prevent damage to the meter movement.
Be sure the power switch is OFF. In any other position, there is a slight drain on
the battery.
CAUTION
To prevent damage from battery leakage, remove the battery if the unit will
not be used for more than two weeks.