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NOTE: All products are well calibrated before
shipment. Recommended recalibration cycle:
1 year.
Acoustic Calibrat or
6. MEASUREMENT PREPARATION
① Remove the battery cover on the back and put in
one 9V battery.
② Recover the back cover.
③ When battery voltage drops below the operating
voltage or battery aging, this symbol will appear
on LCD. Replace the 9V battery.
④When the AC adapter is used, insert the plug of
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