PTI - The Fluorescence Solutions Company | Complete Systems for Fluorescence Spectroscopy, Fluorescence Lifetimes, Fluorescence Imaging and Ionic Detection fluorescence, fluorescence lifetime, ratio fluorescence, time-resolved fluorescence, TCSPC, fluorescence imaging, ratio imaging, fluorescence decay, anisotropy, polarization, fluorimeter, fluorometer, spectrofluorometer, fluorescence instruments, fluorometer, steady state, phosphorescence, photometry, lab instruments, scientific instruments, photon technology, pti Photon Technology International designs, manufactures and markets proprietary electro-optical instruments. PTI offers complete systems for fluorescence spectroscopy, fluorescence lifetimes, fluorescence imaging and ionic detection.