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Chemtrol Free Chlorine PPM Sensor Upgrade Kit Complete - 0-10 ppm pipe-size_Variable Range and includes a padded footrestThis is a Chemtrol Free Chlorine PPM Sensor Upgrade Kit with 0 010 ppm readings. The upgrade kit is used on Chemtrol controllers that did not originally include the PPM controller or cell but now can be upgraded. If you have a Chemtrol controller and you want to upgrade, check out the upgrade kit. It includes the probe, software to upgrade the controller, PPM cell, 15 feet of 1 4 inch tubing and miscellaneous plumbing parts. The new Chemtrol PPM solid