The Wallac 1450 MicroBeta is a liquid scintillation counter and luminescence detector. This system can accommodate either 1, 2, 3, 6, or 12 detectors, each of which can count in 96- and 24- or 96- and 384-well plate formats. Samples may be counted in microplates, tubes, or on filters for added flexibility. The counter features dual photomultiplier tubes (PMT), with the first PMT set over the sample and the second located below. This method of coincidence counting provides optimal productivity for any compatible assay, including proximity and filtration assays among others.