The Uvector LPI ultraviolet intensity sensor for Berson's low-pressure GSW, LSW and Streamline ranges, supplied on a core-exchange basis: the price shown applies against return of the old sensor. Order the outright-purchase listing, item 1029-0904, if no core is being returned. The LPI is calibrated for low-pressure lamp output and is not interchangeable with the medium-pressure MPI sensor. 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.