The D16 PortaSens III Handheld Monitor with the Ozone Sensor part number 00-1009 can have the detecting range set by the user at any range from 0-5 ppm ozone up to 0-200 ppm ozone. The resolution is 0.1 ppm ozone at any range from 0-5 ppm up to 0-49.9 ppm ozone. The resolution of the readout on the screen is 1 ppm ozone when set at the range of 0-50 ppm up to 0-200 ppm. The standard range for this sensor is 0-20 ppm ozone, which has a resolution of 0.1 ppm.
Purchase D16 Handheld Monitor with O3 Sensor 00-1009 here: https://www.oxidationtech.com/d-16-gas-detector.html#970=307
If you already have a C16 or D16 PortaSens monitor and need only the replacement ozone sensor, you can purchase just the sensor cartridge PN# 00-1009 here: https://www.oxidationtech.com/ati-ozone-sensor-00-1009.html