Sper Scientific 840018 Sound Level Meter Pen - Manual (Page 6)

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level is above 130dB.
• "UNDER" is displayed when the
sound level is below 32dB.
4. During the measurement procedure,
press the Power / Max Hold button to
freeze the measurement. "MAX" and
the measurement are displayed. When
the frozen sound level measurement is
exceeded, the new maximum
measurement will be displayed. Press
the Power / Max Hold button again to
exit this function.
5. To turn the unit off, press and hold the
Power /Max Hold button for 2 seconds.
Battery Replacement
Replace the battery when the low battery
icon is displayed. press the Battery Cover
to slide it down and off. Insert two 1.5V
batteries, paying attention to the polarity as
indicated in the compartment. Reattach
the cover.
Optional Accessories
840031 - Acoustical Calibrator
840091 - Wind Screen Replacement