OHAUS Guardian 3000 Hotplate-Stirrer Manuel D'instructions page 28

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EN-26
Rotate the left knob to scroll to the desired beeper setting. EN for enable and
5.
DIS for disable.
6. Briefly press the left knob to confirm your selection.

Rotate the left knob to BACK.
7.
8. Briefly press the left knob to return to the top level of the settings menu.

Rotate the left knob to scroll to ESC.
9.
10. Briefly press the left knob to return to the main operating screen.

Note: There is not an icon to indicate that the beeper has been disabled.
TM
Guardian Hotplate-Stirrers