Profile: Products For Research, Inc deals with housings for photomultipliers and optoelectronic devices. Our products include photomultiplier socket assemblies, magnetic shielding, electrostatic shielding, RFI shielding, evacuated double pane window cells, temperature control photomultiplier coolers, thermoelectric cooled photomultiplier housings, compressor cooled photomultiplier housings and dry ice / liquid nitrogen cooled photomultiplier housings. Our photomultipliers are supplied with an interchangeable photomultiplier tube socket assembly. These interchangeable tube socket assemblies are not only interchangeable with sockets used in housings of the same type but are also interchangeable with sockets provided with any other housing for the same nominal diameter PMT. Each PMT socket assembly comes potted for light tightness, hermetic seal and thermal insulation. Included in the socket assembly is the appropriate PMT socket, the fully wired voltage divider network utilizing quality metal film resistors and ceramic disc capacitors, appropriate high voltage and signal connector & an assembly of precision injected molded parts.