KANOMAX 3443 Digital Dust Monitor - Manual (Page 33)

3. Display Description and operation Procedure
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<Beep Sound Setting (On/OFF)>
You can set whether to activate the beep ON or OFF for key operation.
When ON/OFF setting is highlighted, you can change the setting by
using [▲] [▼] keys.
After setting, press [SET] key.
The setting will stop being highlighted, and now you can select the next
item to be configured.
<Saving the settings>
Press [SET] key to save the settings and go back to the UTILITY screen.