Thermo Fisher Scientific Eutech DO 700 - Manual (Page 13)

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6) Press to confirm the calibration. The primary display will blink
briefly before returning to measurement mode.
NOTE: The minimum calibration value is 2 mg/L. In addition, the
calibration is limited to ±40% adjustment of the factory default value to
prevent erroneous calibrations.
5. SETUP FUNCTIONS
Use the setup feature to customize your instrument operation.
There are two setup menus; one menu is derived from the %
saturation mode and the other from the mg/L (or ppm) concentration
mode.
First, select the appropriate measurement mode you wish to adjust by
pressing until the desired units are displayed. During
measurement, press and hold for 5 seconds to enter SETUP
mode of the parameter being measured.
Press or to change programs or change options.
Press to select the program or confirm selection.
Press to go back one level or return to measurement mode.
5.1 1.0 CAL (Calibration)
Press to view stored calibration points.
Note: % saturation mode will list two points, while
concentration mode has only one point.