Kuntze's equipment offers different disinfection measurement ranges.
0-1000 µg/L (ppb)
0-5.00 mg/L (ppm)
0-10.00 mg/L (ppm)
0-20.00 mg/L (ppm)
To change these settings to the range that best fits your application go to the Main Menu > In/Out > Analog > and locate the section for measuring range to choose your desired range.
If you change the measuring range, the internal calibration value will change to factory calibration.