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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 the adapter （3.5φ） into the DC
9V connector on the side panel.
7. OPERATING PROCEDURE
① Power on the meter.
② Press ‘LEVEL’ button to select desired level,
base on ‘UNDER’ or ‘OVER’ do not appear on
LCD.
③ Select ‘dBA’ for general noise sound level and
‘dBC’ for measuring sound level of acoustic
material.
④ Select ‘FAST’ for instant sound and ‘SLOW’ for
average sound level.
⑤ Select ‘MAX/MIN’ button for measuring
maximum and minimum noise level.
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