Nova-Tech DO 6+ - Manual (Page 15)

Instruction Manual DO 6+
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The DO 6+ will accept one calibration point in concentration mode. The
minimum value is 2 mg/L (ppm), and the calibration window is +/- 40% of the
factory default value.
Temperature and % saturation calibration should take place before attempting
to perform mg/L (ppm) concentration calibration.
Calibration of the concentration mode will only replace the previous
concentration calibration and does not affect the % saturation calibration.
To offset your % saturation reading to match another instrument, see Section
5.8 — % Saturation Offset Adjustment
.
New calibration values will automatically override the existing data. Perform
daily calibration for best results. To completely recalibrate the meter and when
installing a replacement electrode, it is best to clear all calibration data. See
Section 5.7Reset to Factory Default
.