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Yes, that is the basic range of measurement, but you can scale that up by dilution. So, any CLO2 concentration can be measured. I have measured as high as 10,000 ppm. You do the same if using CLO2 test strips. See this how-to file.
I have looked at the eXact Chlorine Photometer which has a measurement range of 0.00 mg/L - 2.20 mg/L (ppm)