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The recommended recalibration cycle is one year.
8. Basic Operation
(1)
Open battery cover and install a 9-volt battery into the battery
compartment.
(2)
Close the battery compartment.
(3)
When the low battery icon "
" appears, replace the
battery.
(4)
When the AC adapter is used, insert the plug of the adapter
(
3.5φ
)
into the DC 9V connector on the side panel and you must
remove the 9V battery.
Note: If the adapter and battery are used at the same time the
warranty is invalid.