Aquametrix AM-TBR Turbidimeter User Manual - Manual (Page 17)

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The security code (333) must be entered to gain access to CAL or CONFIG menus.
Notice that the first number in the code is flashing; the flashing indicates that this is the
number to be changed. Use the
or
arrows to select the first of the three numbers in
the code and then press the ↵ button to accept the first number of the code. Now enter
the second number in the code. Proceed as with the first number followed by ↵. Then
repeat the process for the third number in the access code, and finish with the ↵
button.
If the valid access code has been selected, the instrument will be directed to the
calibration mode. If the wrong access code is selected, the instrument will return to the
AUTO mode. Refer to section 7.7 for more information.