Online Water Quality Monitoring (OWQM) You Can Count On The Halogen Systems MP5™ Online Chlorine Analyzer Brings Accurate Readings, Stable Calibrations, and Low Maintenance Halogen’s MP5™ online chlorine analyzer set a new industry standard for continuous online water quality monitoring. The MP5™ is approved for NSF-61 use and measures five parameters simultaneously. By combining a pH analyzer, ORP analyzer, and conductivity analyzer, the unit is able to capture an accurate