Each time you press “LEVEL” button, the level range
will change between ‘Lo’ level, ‘Med’ level, ‘Hi’ level
and ‘Auto’ level in the circular.
⑧
Backlight button
Turn the backlight on/off
⑨
Frequency weighting select button
A
：
A-Weighting
C
：
C-Weighting
⑩
HOLD button:
Press “HOLD” button, The hold function freezes the
reading in the display.
⑾
Power button
Turn the meter power ON/OFF
⑿
External DC 9V power supply terminal
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