The Uvector LPI is the ultraviolet intensity sensor fitted to Berson's low-pressure ranges — the GSW and LSW series and the larger Streamline reactors. The LPI and the medium-pressure MPI are not interchangeable: they are calibrated to different lamp spectra, so fitting the wrong one produces a reading that looks plausible and is wrong. This is the outright-purchase listing; the same sensor is also stocked on a core-exchange basis under item 10172-0610. Berson UV-techniek of Nuenen, the Netherlands, has built ultraviolet disinfection plant since 1972 and is part of the Halma UV group alongside Hanovia and Aquionics.