These accessories are only for the now-discontinued Turner BioSystems Luminometer Model TD-20/20. They are not for the Turner BioSystems 20/20n Single-Tube Luminometer or Promega GloMax 20/20 Luminometer. Turner BioSystems and Promega have teamed up to develop the next-generation luminometers for single-tube and 96-well plate analysis. For more information, see the GloMax Luminometer catalog pages or contact Technical Support.