The Horiba Jobin Yvon (HJY) Fluoromax 3 spectrofluorimeter is used to measure emission and excitation spectra of light emitting or fluorescent samples. In addition, the instrument is equipped with a pair of automatic polarizers that allow for the measurement of fluorescence polarization and anisotropy (typically used for measurement of ligand-receptor binding). The sample temperature can be controlled using an external water bath and stirred using an integrated stirrer. A variable angle solids sample holder is available.