You Reply: Hi! Could you make measurements?there is a phyton script in the .zip file of the library. Im working on arduino, the values returned from the sensor doesn t seem to be congruent. Te PPB concentration goes from 60 to 125 with or with or with out the ozone generator ON. I left the sensor power up for 48hs for the firs time, the addres is correct, i try automatic and pasive mode...but no differences....I am missing something??