The Pyxis ST-765SS Series are stainless steel multi-parameter membrane-less sensors based on unique electrochemical principles to determine free chlorine or chlorine dioxide and pH content in water. These sensors incorporate Pyxis' advanced technology in the field of bare-gold electrochemical detection. The ST-765SS-FLC sensor integrates free chlorine, plus pH measurement while the ST-765SS-CLO integrates chlorine dioxide plus pH measurement. Both can perform temperature and pH compensation for the measurement of free chlorine or chlorine dioxide based on conditions present in the application of use. This unique internal compensation results in a highly accurate oxidizer measurement consistent with DPD wet chemistry methodology as high as a pH of 9.0 and is compliant with USEPA – 334.0 and ISO-7393 guidelines.