Oxygen Enterprises, Ltd. is focused to design and development of novel instruments for basic research, medicine, and industry. The firm is currently focusing on a new optical method for measuring oxygen called Phosphorescence Quenching. This is a non-invasive optical method with high accuracy and absolute calibration, and it extends the ability to accurately measure oxygen to many conditions inaccessible to other techniques. As such, it is a technology with broad applicability in basic research and industry. In addition to a rapidly expanding range of instruments and phosphors, the firm will design instruments and phosphors for non-standard applications.