An on-site calibration is needed for an accurate measurement. It is derived by a reference measurement, such as the colorimetric DPD reference measurement.
Please use only photometric instruments.
To get to the Calibration Menu go to:
Main menu > Cal > Cal Dis
Helpful article: How to Clean and Calibrate your Zirkon® DIS Sensor (Free Chlorine, Chlorine Dioxide, Ozone, Hydrogen Peroxide)
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