GLI International Inc., of Milwaukee, has a wide variety of analyzers and sensors to meet a wide variety of applications found in the wastewater marketplace. The Z63/5040 Galvanic Dissolved Oxygen System is used in the toughest of applications. It requires minimal maintenance with a self-cleaning galvanic probe that uses no electrolyte. The D63 Analyzer is used with GLI Ross or Clark membrane style probes for those applications requiring remote monitoring and remote maintenance.