Oxyphor LLC features an optical method for oxygen (O2) measurements based on phosphorescence quenching. The phosphorescence quenching method is non-invasive, except for special molecular probes, Oxyphors, which are dissoled directly in the measurement medium. Our products include a family of Oxyphors, which enable fast, selective and accurate oxygen measurements in biological environments, including in tissue in vivo. To enable measurements with Oxyphors, we feature versatile phosphorescence lifetime instruments (Oxyled's), optimized specifically for oxygen measurements in the physiological oxygen range.